Updated 2 h ago

Vulnerability database

Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.

1,762exploited flaws on CISA’s list

34added in the last 30 days

347new WordPress flaws this week

390,007entries in the database

168 results · page 1 of 4

Oct 21, 2026A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query (RD=0) may exit with an assertion failure, resultiCVE-2026-97313 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query (RD=0) may exit with an assertion failure, resulting in a denial of service. To be vulnerable, the BIND server must allow recursive queries and have at least two RPZ zones configured: one with the default setting of "recursive-only yes", and the other with "recursive-only no". This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Oct 21, 2026A BIND resolver that is configured with both a "redirect" zone and "qname-minimization strict" may abort with an assertion failure while processing the redirectCVE-2026-96888 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
A BIND resolver that is configured with both a "redirect" zone and "qname-minimization strict" may abort with an assertion failure while processing the redirect. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Oct 21, 2026Replaying GSS-TSIG signed UDP messages can result in memory corruption in "`named`".CVE-2026-94300 · Other software · ISC · reported by security-officer@isc.orgHigh 8.1
Replaying GSS-TSIG signed UDP messages can result in memory corruption in "`named`". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote code execution. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Oct 21, 2026In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with no limit imposed by BIND.CVE-2026-19630 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with no limit imposed by BIND. A DNS message with a maliciously large number of such structures will cause BIND to consume disproportionate amounts of CPU time and memory during processing. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026If a BIND resolver sends a query for a DNSSEC-signed authoritative zone, and the authoritative server replies with a valid wildcard answer and signed NSEC3 prooCVE-2026-80274 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
If a BIND resolver sends a query for a DNSSEC-signed authoritative zone, and the authoritative server replies with a valid wildcard answer and signed NSEC3 proof, followed by an unsigned NSEC at the same owner name, it will trigger an unexpected program exit. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answCVE-2026-77119 · Other software · ISC · reported by security-officer@isc.orgMedium 5.9
A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026If BIND is loaded with a "`named.conf`" file that contains no global "`options`" block, an attacker can send a query of QTYPE TKEY which may cause an assertion CVE-2026-76163 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
If BIND is loaded with a "`named.conf`" file that contains no global "`options`" block, an attacker can send a query of QTYPE TKEY which may cause an assertion failure and subsequent unexpected program exit. This issue affects BIND 9 versions 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026In a query response, an attacker may send `named` multiple copies of a record that should only exist once (such as an SOA record).CVE-2026-75029 · Other software · ISC · reported by security-officer@isc.orgMedium 5.3
In a query response, an attacker may send `named` multiple copies of a record that should only exist once (such as an SOA record). If the RDATA is the same on all the copies, the record is appended to the in-memory RDATA set, which can cause increased memory usage of the negative cache and possibly lead to other memory attack vectors. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026A BIND recursive resolver may experience excessive resource consumption if it encounters large numbers of a particular kind of invalid DNSSEC record.CVE-2026-19668 · Other software · ISC · reported by security-officer@isc.orgMedium 5.3
A BIND recursive resolver may experience excessive resource consumption if it encounters large numbers of a particular kind of invalid DNSSEC record. Default limits on "max-records-per-type" and "max-types-per-name" help mitigate the exposure. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process wiCVE-2026-19666 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026For a secondary zone with transfers restricted by TSIG, `named` may start to serve the data provided in a zone transfer before the final message with the TSIG sCVE-2026-19033 · Other software · ISC · reported by security-officer@isc.orgMedium 6.5
For a secondary zone with transfers restricted by TSIG, `named` may start to serve the data provided in a zone transfer before the final message with the TSIG signature arrives. This could allow an attacker that does not actually possess a valid TSIG signature to send unauthorized zone contents to a secondary server. Although no TSIG signature ever arrives, `named` does not rollback to the pre-transfer state. To exploit the vulnerability, the transfer must be a multi-message TCP IXFR, as described by RFC 8945. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPCVE-2026-81736 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate internal resouCVE-2026-81563 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate internal resources. If this happens repeatedly, resource exhaustion will eventually prevent the resolver from performing new recursive lookups. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026A malformed zone may contain an NS or DNAME node above its origin, which `named` treats as a zone cut.CVE-2026-78301 · Other software · ISC · reported by security-officer@isc.orgMedium 5.8
A malformed zone may contain an NS or DNAME node above its origin, which `named` treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an out-of-zone delegation. On a server that also provides recursion BIND can follow this locally sourced cut and cache attacker-supplied data, affecting names outside the configured zone. This situation persists as long as the malformed zone remains in the zone database. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026An attacker can cause `named` to abort by sending a crafted DNS-over-HTTPS request with a cryptographically invalid SIG(0) record, and then closing the transporCVE-2026-77692 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
An attacker can cause `named` to abort by sending a crafted DNS-over-HTTPS request with a cryptographically invalid SIG(0) record, and then closing the transport connection prematurely. This issue affects BIND 9 versions 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026An inapplicable NSEC record may be accepted by a `named` resolver as proof that no wildcard exists, which could allow an attacker at the same or an upstream levCVE-2026-19941 · Other software · ISC · reported by security-officer@isc.orgMedium 5.9
An inapplicable NSEC record may be accepted by a `named` resolver as proof that no wildcard exists, which could allow an attacker at the same or an upstream level of the zone name to mask the existence of a victim's wildcard record. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026If an attacker-controlled authoritative server can produce a negative answer that is exactly 65536 bytes, then a flaw in `named` results in a negative cache entCVE-2026-19667 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
If an attacker-controlled authoritative server can produce a negative answer that is exactly 65536 bytes, then a flaw in `named` results in a negative cache entry of 0 bytes. When this entry is subsequently read, `named` aborts. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Sep 16, 2026An attacker may be able to cause a `named` resolver to abort.CVE-2026-19662 · Other software · ISC · reported by security-officer@isc.orgMedium 5.9
An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org kb.isc.org
Jul 22, 2026The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.CVE-2026-13321 · Other software · ISC · reported by security-officer@isc.orgHigh 8.6
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Jul 22, 2026If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types, then BIND may exiCVE-2026-13204 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating this proof. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Jul 22, 2026The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records.CVE-2026-12617 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org kb.isc.org
Jul 22, 2026It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained.CVE-2026-11721 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes `named` to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to have any effect, the resolver under attack must have set `synth-from-dnssec yes;` (which is the default). This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Jul 22, 2026A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage.CVE-2026-11622 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Jul 22, 2026The issue is a resource exhaustion vulnerability associated with DNSSEC validation.CVE-2026-11605 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time. This issue affects BIND 9 versions 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, and 9.20.9-S1 through 9.20.24-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Jul 22, 2026An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error conditCVE-2026-11331 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Jul 22, 2026If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and may subsequently abort and exit.CVE-2026-10822 · Other software · ISC · reported by security-officer@isc.orgMedium 6.5
If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and may subsequently abort and exit. BIND will first need to store a DNS record for a key (KEY, DNSKEY, etc.). That key must specify a PRIVATEDNS algorithm (253), and in the algorithm identifier, improperly give a length longer than the actual identifier data. The invalid identifier will be stored. If BIND later needs to render that record to text, it will use the invalid length during processing, leading to a consistency check failing. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Jul 22, 2026BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses.CVE-2026-10723 · Other software · ISC · reported by security-officer@isc.orgMedium 6.8
BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
May 20, 2026An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cauCVE-2026-5950 · Other software · ISC · reported by security-officer@isc.orgMedium 5.3
An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
May 20, 2026Undefined behavior may result due to a race condition leading to a use-after-free violation.CVE-2026-5947 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIND receives an incoming DNS message signed with SIG(0), it begins work to validate that signature. If, during that validation, the "recursive-clients" limit is reached (as would occur during a query flood), and that same DNS message is discarded per the limit, there is a brief window of time while the SIG(0) validation may attempt to read the now-discarded DNS message. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.28 through 9.18.49 and 9.18.28-S1 through 9.18.49-S1 are NOT affected.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
May 20, 2026Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, orCVE-2026-5946 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data — can cause assertion failures in `named`. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
May 20, 2026A use-after-free vulnerability exists within the DNS-over-HTTPS implementation.CVE-2026-3593 · Other software · ISC · reported by security-officer@isc.orgHigh 7.4
A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
May 20, 2026BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack.CVE-2026-3592 · Other software · ISC · reported by security-officer@isc.orgMedium 5.3
BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
May 20, 2026BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processinCVE-2026-3039 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets. Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments. This issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Mar 25, 2026A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0).CVE-2026-3591 · Other software · ISC · reported by security-officer@isc.orgMedium 5.4
A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Mar 25, 2026Under certain conditions, `named` may crash when processing a correctly signed query containing a TKEY record.CVE-2026-3119 · Other software · ISC · reported by security-officer@isc.orgMedium 6.5
Under certain conditions, `named` may crash when processing a correctly signed query containing a TKEY record. The affected code can only be reached if an incoming request has a valid transaction signature (TSIG) from a key declared in the `named` configuration. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Mar 25, 2026A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain.CVE-2026-3104 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Mar 25, 2026If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU.CVE-2026-1519 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries). This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Jan 21, 2026Malformed BRID/HHIT records can cause `named` to terminate unexpectedly.CVE-2025-13878 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
Malformed BRID/HHIT records can cause `named` to terminate unexpectedly. This issue affects BIND 9 versions 9.18.40 through 9.18.43, 9.20.13 through 9.20.17, 9.21.12 through 9.21.16, 9.18.40-S1 through 9.18.43-S1, and 9.20.13-S1 through 9.20.17-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record downloads.isc.org downloads.isc.org
Oct 22, 2025Querying for records within a specially crafted zone containing certain malformed DNSKEY records can lead to CPU exhaustion.CVE-2025-8677 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
Querying for records within a specially crafted zone containing certain malformed DNSKEY records can lead to CPU exhaustion. This issue affects BIND 9 versions 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record kb.isc.org openwall.com
Oct 22, 2025In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is possible for an attacker to predict the source porCVE-2025-40780 · Other software · ISC · reported by security-officer@isc.orgHigh 8.6
In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is possible for an attacker to predict the source port and query ID that BIND will use. This issue affects BIND 9 versions 9.16.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.16.8-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record kb.isc.org openwall.com
Oct 22, 2025Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache.CVE-2025-40778 · Other software · ISC · reported by security-officer@isc.orgHigh 8.6
Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record kb.isc.org openwall.com
Jul 16, 2025If a `named` caching resolver is configured with `serve-stale-enable` `yes`, and with `stale-answer-client-timeout` set to `0` (the only allowable value other tCVE-2025-40777 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
If a `named` caching resolver is configured with `serve-stale-enable` `yes`, and with `stale-answer-client-timeout` set to `0` (the only allowable value other than `disabled`), and if the resolver, in the process of resolving a query, encounters a CNAME chain involving a specific combination of cached or authoritative records, the daemon will abort with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.10, 9.21.0 through 9.21.9, and 9.20.9-S1 through 9.20.10-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record kb.isc.org openwall.com
Jul 16, 2025A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack.CVE-2025-40776 · Other software · ISC · reported by security-officer@isc.orgHigh 8.6
A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record kb.isc.org
May 21, 2025When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it.CVE-2025-40775 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it. If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record kb.isc.org openwall.com
Jan 29, 2025Clients using DNS-over-HTTPS (DoH) can exhaust a DNS resolver's CPU and/or memory by flooding it with crafted valid or invalid HTTP/2 traffic.CVE-2024-12705 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
Clients using DNS-over-HTTPS (DoH) can exhaust a DNS resolver's CPU and/or memory by flooding it with crafted valid or invalid HTTP/2 traffic. This issue affects BIND 9 versions 9.18.0 through 9.18.32, 9.20.0 through 9.20.4, 9.21.0 through 9.21.3, and 9.18.11-S1 through 9.18.32-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record kb.isc.org security.netapp.com
Jan 29, 2025It is possible to construct a zone such that some queries to it will generate responses containing numerous records in the Additional section.CVE-2024-11187 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
It is possible to construct a zone such that some queries to it will generate responses containing numerous records in the Additional section. An attacker sending many such queries can cause either the authoritative server itself or an independent resolver to use disproportionate resources processing the queries. Zones will usually need to have been deliberately crafted to attack this exposure. This issue affects BIND 9 versions 9.11.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.32, 9.20.0 through 9.20.4, 9.21.0 through 9.21.3, 9.11.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.50-S1, and 9.18.11-S1 through 9.18.32-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record kb.isc.org lists.debian.org
Jul 23, 2024Client queries that trigger serving stale data and that also require lookups in local authoritative zone data may result in an assertion failure.CVE-2024-4076 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
Client queries that trigger serving stale data and that also require lookups in local authoritative zone data may result in an assertion failure. This issue affects BIND 9 versions 9.16.13 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.11.33-S1 through 9.11.37-S1, 9.16.13-S1 through 9.16.50-S1, and 9.18.11-S1 through 9.18.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record openwall.com openwall.com
Jul 23, 2024If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a clieCVE-2024-1975 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests. This issue affects BIND 9 versions 9.0.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.49-S1, and 9.18.11-S1 through 9.18.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record openwall.com openwall.com
Jul 23, 2024Resolver caches and authoritative zone databases that hold significant numbers of RRs for the same hostname (of any RTYPE) can suffer from degraded performance CVE-2024-1737 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
Resolver caches and authoritative zone databases that hold significant numbers of RRs for the same hostname (of any RTYPE) can suffer from degraded performance as content is being added or updated, and also when handling client queries for this name. This issue affects BIND 9 versions 9.11.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.11.4-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.50-S1, and 9.18.11-S1 through 9.18.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record openwall.com openwall.com
Jul 23, 2024A malicious client can send many DNS messages over TCP, potentially causing the server to become unstable while the attack is in progress.CVE-2024-0760 · Other software · ISC · reported by security-officer@isc.orgHigh 7.5
A malicious client can send many DNS messages over TCP, potentially causing the server to become unstable while the attack is in progress. The server may recover after the attack ceases. Use of ACLs will not mitigate the attack. This issue affects BIND 9 versions 9.18.1 through 9.18.27, 9.19.0 through 9.19.24, and 9.18.11-S1 through 9.18.27-S1.
Product
BIND 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record openwall.com openwall.com

Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.

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