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.
15 results
Sep 28, 2026In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportImpl::destroy in releases before v2025.08.18.00) faCVE-2026-91096 · Other software · Facebook · reported by cve-assign@fb.comHigh 7.5
In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportImpl::destroy in releases before v2025.08.18.00) failed to unregister read callbacks for streams that were no longer open before destroying them. The transport could then invoke a read callback that had been freed.
- Product
- proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comfacebook.com
Sep 28, 2026In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could retuCVE-2026-91095 · Other software · Facebook · reported by cve-assign@fb.comMedium 5.3
In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then installed those handles as transport read callbacks, which could lead to use of freed memory.
- Product
- proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comfacebook.com
Sep 28, 2026In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields after calling the base QuicWtSessionBase::closeSessCVE-2026-84895 · Other software · Facebook · reported by cve-assign@fb.comHigh 7.3
In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields after calling the base QuicWtSessionBase::closeSession method. The base method notifies the session handler, which may release the last reference to the session and destroy it.
- Product
- proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comfacebook.com
Jul 23, 2026Proxygen lacked a generalized slow-consumer detection mechanism in its core HTTP session layer.CVE-2026-44909 · Other software · Facebook · reported by cve-assign@fb.comHigh 7.5
Proxygen lacked a generalized slow-consumer detection mechanism in its core HTTP session layer. A remote, unauthenticated attacker could exploit HTTP/2 flow-control by setting SETTINGS_INITIAL_WINDOW_SIZE to 0 or withholding WINDOW_UPDATE frames, causing the server to buffer complete response bodies in memory indefinitely for stalled streams. By opening many simultaneous streams requesting large resources while preventing the server from transmitting responses, an attacker could induce unbounded memory growth leading to service degradation, resource exhaustion, or denial of service. Versions v2017.01.16.00 through v2026.07.20.00 are affected.
- Product
- proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Dec 2, 2025Sending an HTTP request/response body with greater than 2^31 bytes triggers an infinite loop in proxygen::coro::HTTPQuicCoroSession which blocks the backing eveCVE-2025-55181 · Other software · Facebook · reported by cve-assign@fb.comMedium 5.3
Sending an HTTP request/response body with greater than 2^31 bytes triggers an infinite loop in proxygen::coro::HTTPQuicCoroSession which blocks the backing event loop and unconditionally appends data to a std::vector per-loop iteration. This issue leads to unbounded memory growth and eventually causes the process to run out of memory.
- Product
- proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comfacebook.com
May 18, 2020A use-after-free is possible due to an error in lifetime management in the request adaptor when a malicious client invokes request error handling in a specific CVE-2020-1897 · Other software · Facebook · reported by cve-assign@fb.comCritical 9.8
A use-after-free is possible due to an error in lifetime management in the request adaptor when a malicious client invokes request error handling in a specific sequence. This issue affects versions of proxygen prior to v2020.05.18.00.
- Product
- proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordfacebook.comfacebook.com
Dec 4, 2019In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corruCVE-2019-11940 · Other software · Facebook · reported by cve-assign@fb.comCritical 9.8
In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.
- Product
- Proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comfacebook.com
Jul 25, 2019An out of bounds write is possible via a specially crafted packet in certain configurations of Proxygen due to improper handling of Base64 when parsing malformeCVE-2019-11921 · Other software · Facebook · reported by cve-assign@fb.comCritical 9.8
An out of bounds write is possible via a specially crafted packet in certain configurations of Proxygen due to improper handling of Base64 when parsing malformed binary content in Structured HTTP Headers. This issue affects versions of proxygen prior to v2019.07.22.00.
- Product
- Proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comfacebook.com
Dec 31, 2018An issue in the Proxygen handling of HTTP2 parsing of headers/trailers can lead to a denial-of-service attack.CVE-2018-6347 · Other software · Facebook · reported by cve-assign@fb.comHigh 7.5
An issue in the Proxygen handling of HTTP2 parsing of headers/trailers can lead to a denial-of-service attack. This affects Proxygen prior to v2018.12.31.00.
- Product
- Proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Dec 31, 2018A potential denial-of-service issue in the Proxygen handling of invalid HTTP2 priority settings (specifically a circular dependency).CVE-2018-6346 · Other software · Facebook · reported by cve-assign@fb.comHigh 7.5
A potential denial-of-service issue in the Proxygen handling of invalid HTTP2 priority settings (specifically a circular dependency). This affects Proxygen prior to v2018.12.31.00.
- Product
- Proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Dec 31, 2018Proxygen fails to validate that a secondary auth manager is set before dereferencing it.CVE-2018-6343 · Other software · Facebook · reported by cve-assign@fb.comHigh 7.5
Proxygen fails to validate that a secondary auth manager is set before dereferencing it. That can cause a denial of service issue when parsing a Certificate/CertificateRequest HTTP2 Frame over a fizz (TLS 1.3) transport. This issue affects Proxygen releases starting from v2018.10.29.00 until the fix in v2018.11.19.00.
- Product
- Proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Dec 3, 2018A potential denial-of-service issue in the Proxygen handling of invalid HTTP2 settings which can cause the server to spend disproportionate resources.CVE-2018-6332 · Other software · Facebook · reported by cve-assign@fb.comMedium 5.9
A potential denial-of-service issue in the Proxygen handling of invalid HTTP2 settings which can cause the server to spend disproportionate resources. This affects all supported versions of HHVM (3.24.3 and 3.21.7 and below) when using the proxygen server to handle HTTP2 requests.
- Product
- HHVM
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 9, 2017Facebook Proxygen before 2015-11-09 mismanages HTTPMessage.request state, which allows remote attackers to conduct hijacking attacks and bypass ACL checks.CVE-2015-7265 · Other software · Proxygen Project · reported by cret@cert.orgHigh 7.5
Facebook Proxygen before 2015-11-09 mismanages HTTPMessage.request state, which allows remote attackers to conduct hijacking attacks and bypass ACL checks.
- Product
- Proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgroups.google.comgroups.google.com
Apr 9, 2017The SPDY/2 codec in Facebook Proxygen before 2015-11-09 truncates a certain field to two bytes, which allows hijacking and injection attacks.CVE-2015-7264 · Other software · Proxygen Project · reported by cret@cert.orgCritical 9.8
The SPDY/2 codec in Facebook Proxygen before 2015-11-09 truncates a certain field to two bytes, which allows hijacking and injection attacks.
- Product
- Proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgroups.google.comgroups.google.com
Apr 9, 2017The SPDY/2 codec in Facebook Proxygen before 2015-11-09 allows remote attackers to conduct hijacking attacks and bypass ACL checks via a crafted host value.CVE-2015-7263 · Other software · Proxygen Project · reported by cret@cert.orgHigh 7.5
The SPDY/2 codec in Facebook Proxygen before 2015-11-09 allows remote attackers to conduct hijacking attacks and bypass ACL checks via a crafted host value.
- Product
- Proxygen
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgroups.google.comgroups.google.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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