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.
548 results · page 1 of 11
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-71490 · Other software · opnsense · reported by GitHubHigh 7.1
OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.11, OPNsense\Core\ACL::hasPrivilege() appends a directly assigned comma-separated <priv> value as one string and then uses an exact comparison when checking user-config-readonly. A user directly assigned both a component write privilege and user-config-readonly can therefore be treated as lacking the read-only restriction, and MVC APIs protected by throwReadOnly() can persist configuration changes for that component. Group privileges are not affected by the same parser flaw because the group path already splits comma-separated values. This issue is fixed in version 26.1.11.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-63442 · Other software · opnsense · reported by GitHubHigh 8.1
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the unauthenticated WebGUI login usernamefld accepts carriage-return and line-feed characters that survive LOG_AUTH processing through syslog-ng-lockout.conf into the syslog-ng program destination feeding lockout_handler. The consumer's readline() processing treats an injected fragment as a separate authentication event and selects the first syntactically valid IP address from the forged line. An attacker with network access to the login page can forge failure events for another IP, causing that IP to be added to the sshlockout PF table and its active states to be killed, or forge accepted events that reset an attacker's own brute-force counter. This can block administrative, DNS, gateway, or monitoring addresses and can bypass password-guessing lockout without authentication. This issue is fixed in version 26.1.11.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-58395 · Other software · opnsense · reported by GitHubMedium 4.3
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the safe-delete path reached through ApiMutableModelControllerBase::delBase() interpolates an unvalidated safe-delete token from the request URL into an XPath expression over config.xml before confirming that the token is a valid identifier. A user holding any one affected module privilege can send a crafted token to one of 21 affected delete endpoints covering Traffic Shaper, DHCP relay, Dnsmasq, Firewall Category, or Kea DHCP, causing the XPath to match configuration data across modules. The resulting error response exposes configuration item names, descriptions, reference paths, and UUIDs and provides an XPath substring-presence oracle, including for modules the user cannot otherwise access. The request does not modify configuration or perform a deletion. This issue is fixed in version 26.1.11.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-58394 · Other software · opnsense · reported by GitHubMedium 5.2
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, src/www/system_advanced_admin.php reads certificate records into $a_cert but omits that array from legacy_html_escape_form_data() before rendering each certificate descr value in the SSL Certificate selector. The certificate description accepts HTML metacharacters, allowing a user with the page-system-certmanager privilege to store markup that executes when another user opens System Settings Administration. This issue is fixed in version 26.1.11.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-58393 · Other software · opnsense · reported by GitHubMedium 5.9
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the OpenVPN Client Specific Override common_name field accepts path traversal sequences and openvpn_csc_conf_write() concatenates the value into /var/etc/openvpn-csc/<vpnid>/<common_name> without normalization or a basename check. The affected event handlers are client_connect.php and user_pass_verify.php. An authenticated user with Client Specific Override privileges can store the traversal value, and a matching OpenVPN client-connect or authentication event causes a generated CSO file to be written outside the intended directory. The file content is generated OpenVPN configuration rather than arbitrary bytes, and practical exploitation requires the attacker to cause a matching common name or username to be processed. This issue is fixed in version 26.1.11.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-58392 · Other software · opnsense · reported by GitHubMedium 5.4
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the NTP GPS page stores the operator-supplied initcmd value in base64 form, applies legacy_html_escape_form_data() to the encoded string, and then uses base64_decode() to decode the value directly into the GPS initialization-command textarea in src/www/services_ntpd_gps.php. Because decoding occurs after escaping, stored HTML remains unescaped at the output sink. A user with page-services-ntp-gps privilege can store a value that closes the textarea, and script executes in the session of any user who later opens the GPS page. The script can read CSRF material and perform authenticated actions, including actions available to an administrator. This issue is fixed in version 26.1.11.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-58391 · Other software · opnsense · reported by GitHubMedium 5.4
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, Firewall Rules and NAT views place stored category names and alias descriptions into HTML title attributes in filter_rule.volt and nat_rule.volt without quote-safe encoding. The response layer uses ENT_NOQUOTES, so a double quote survives and closes the attribute, allowing an event-handler attribute to be added to the existing span. A user with Firewall Categories or Firewall Alias Edit privileges can store a category name or alias description; the category must be assigned to a filter or NAT rule, or the alias must be referenced by a rule source or destination, and the rule must be saved so the affected tooltip is rendered. Script then executes in the session of an administrator or other user who opens the affected Rules or NAT page. The script can access CSRF material and perform authenticated actions as the victim. This issue is fixed in version 26.1.11.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-58390 · Other software · opnsense · reported by GitHubHigh 8
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the OpenVPN connection-status dashboard widget in src/opnsense/www/js/widgets/OpenVPNClients.js and the connection-status view place a client common_name into data-common-name attributes without quote-safe encoding. Exploitation requires an OpenVPN server configured with username-as-common-name and RADIUS or LDAP authentication, plus the ability to provision or self-register a valid backend username containing a double quote; deployments where the same administrator controls both the identity backend and firewall do not cross a separate trust boundary. An authenticated client using that username can close the attribute and add an event handler, while the local user database is not affected because its username validator rejects quotes. Script executes in an administrator's session when the administrator opens the dashboard or connection-status page and the injected event is triggered; the demonstrated payload used pointer movement over the client row rather than unconditional page-load execution. The advisory demonstrates that the script can read config.xml, invoke privileged APIs, reset the root p
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-57155 · Other software · opnsense · reported by GitHubCritical 9.9
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the Firewall Alias GeoIP importer's process_zip() and process_gzip() paths in src/opnsense/scripts/filter/lib/alias/geoip.py use an unvalidated CSV country_code value to construct output filenames below /usr/local/share/GeoIP/alias. A user with Firewall Alias Edit privilege can configure an attacker-controlled GeoIP source URL and supply an archive whose country code traverses into another existing directory, causing attacker-controlled content to be written as root with an -IPv4 or -IPv6 suffix. A crafted newsyslog fragment and oversized log file can use the default hourly root cron job to execute commands as root, resulting in complete firewall compromise. This issue is fixed in version 26.1.11.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-53582 · Other software · opnsense · reported by GitHubHigh 7.1
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.10, the Trust module stores attacker-controlled certificate authority and certificate refid values and interpolates them into XPath expressions in src/opnsense/mvc/app/models/OPNsense/Trust/FieldTypes/CAsField.php and src/opnsense/mvc/app/models/OPNsense/Trust/FieldTypes/CertificatesField.php. A user with CA Manager or Certificate Manager privileges can submit a crafted refid and repeatedly retrieve the object to obtain a boolean refcount oracle, allowing values in config.xml to be recovered character by character. Exposed values can include password hashes, API credentials, certificate private keys, VPN key material, and high-availability credentials, enabling privilege escalation and compromise of other security domains. This issue is fixed in version 26.1.10.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026The framebuffer device model's maximum resolution constants were duplicated between the framebuffer and RFB modules and had gotten out of sync.CVE-2026-101311 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7
The framebuffer device model's maximum resolution constants were duplicated between the framebuffer and RFB modules and had gotten out of sync. Additionally, writes to the framebuffer BAR could set arbitrary width and height values without validation, and the framebuffer BAR I/O and RFB rendering threads were not synchronized. A malicious guest can crash the bhyve process or potentially execute arbitrary code in the host userspace context running the virtual machine, subject to bhyve's Capsicum sandbox.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026The HDA audio device model did not check for zero-length Buffer Descriptor List (BDL) entries when starting a stream.CVE-2026-101310 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7
The HDA audio device model did not check for zero-length Buffer Descriptor List (BDL) entries when starting a stream. A zero-length entry caused an out-of-bounds read or write during DMA transfer processing. BDL fields were also subject to modification by the guest after validation. A malicious guest can crash the bhyve process or potentially execute arbitrary code in the host userspace context running the virtual machine, subject to bhyve's Capsicum sandbox.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026The xHCI (USB 3) device model did not validate or save the event ring size provided by the guest.CVE-2026-101309 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7
The xHCI (USB 3) device model did not validate or save the event ring size provided by the guest. The size was re-read from guest memory on each use, and Transfer Request Block (TRB) fields were loaded without protection against concurrent modification by the guest. This race condition could be triggered by a guest running malicious, privileged code. A malicious guest can crash the bhyve process or potentially execute arbitrary code in the host userspace context running the virtual machine, subject to bhyve's Capsicum sandbox.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026kqueue_fork_copy_knote() indexed into the child's file descriptor table using a knote's file descriptor number without a bounds check.CVE-2026-58100 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7
kqueue_fork_copy_knote() indexed into the child's file descriptor table using a knote's file descriptor number without a bounds check. Because the child's table is copied before knotes are transferred, a concurrent thread in the parent could grow the parent's table and register knotes with file descriptor numbers beyond the end of the child's table, causing an out-of-bounds read. An unprivileged local user may be able to exploit these races to escalate privileges.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026When copying knotes from a parent kqueue to a child, the copy code did not correctly exclude marker knotes (used internally to track list traversal position) beCVE-2026-58099 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7
When copying knotes from a parent kqueue to a child, the copy code did not correctly exclude marker knotes (used internally to track list traversal position) before marking them as in-flux and releasing the kqueue lock. If another thread freed a marker while the lock was dropped, the subsequent in-flux decrement operated on freed memory. An unprivileged local user may be able to exploit these races to escalate privileges.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026When semop(2) blocks waiting for a semaphore condition, it releases the per-set lock and sleeps.CVE-2026-58098 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 8.4
When semop(2) blocks waiting for a semaphore condition, it releases the per-set lock and sleeps. Upon waking, it checks the sequence number embedded in the semaphore set's IPC identifier to detect whether the set was removed while the caller was asleep. This sequence number is only 15 bits wide. If enough semaphore sets are created and destroyed in the same table slot while a caller is blocked, the counter wraps around, and semop(2) may falsely conclude that the original set still exists. The subsequent access to a semaphore within the set may then be out of bounds. An unprivileged local user can trigger an out-of-bounds access on kernel heap memory, potentially leading to privilege escalation.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026When an audio channel's buffer needs to be resized, the sound(4) driver checks that the buffer is not memory-mapped and then drops the channel lock to allocate CVE-2026-101308 · Other software · FreeBSD · reported by secteam@freebsd.orgMedium 5.5
When an audio channel's buffer needs to be resized, the sound(4) driver checks that the buffer is not memory-mapped and then drops the channel lock to allocate a new buffer. An mmap(2) call on another thread can complete during this window, after which the resize path frees the now-mapped buffer without rechecking. An unprivileged local user with access to a sound device can exploit this race to trigger a use-after-free in the kernel, potentially escalating privileges.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026When the PCM sample array needs to grow, the RACK stack doubles a 16-bit allocation counter.CVE-2026-101307 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 8.2
When the PCM sample array needs to grow, the RACK stack doubles a 16-bit allocation counter. Repeated doublings caused the counter to wrap to zero, resulting in a near-zero-length allocation followed by a copy of the existing samples into the undersized buffer. A remote peer can trigger the expansion by sending a sufficient number of ACKs on an established connection. A remote attacker who can establish a TCP connection to a system using the RACK stack can trigger an out-of-bounds write of approximately 512 KB in the kernel heap possibly resulting in a kernel panic.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred.CVE-2026-101306 · Other software · FreeBSD · reported by secteam@freebsd.orgCritical 9.8
SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred. A process could clear the restriction by sending the descriptor to itself over a Unix domain socket. A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments.CVE-2026-101305 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 8.8
renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root. A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026When fdescfs(4) was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit FD_RESOLVE_BENEATH or the Capsicum cCVE-2026-101304 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.1
When fdescfs(4) was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit FD_RESOLVE_BENEATH or the Capsicum capability rights of descriptor N. A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026The IPv6 UDP send path for unconnected sockets did not apply the jail policy of rewriting a loopback destination address to the jail's primary IPv6 address.CVE-2026-101303 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.5
The IPv6 UDP send path for unconnected sockets did not apply the jail policy of rewriting a loopback destination address to the jail's primary IPv6 address. A process in a classic (non-VNET) jail can send UDP datagrams to services listening on the host's IPv6 loopback address, bypassing jail network isolation.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026TLS 1.3 embeds the actual record type as the last non-zero byte of the decrypted payload, optionally followed by zero padding.CVE-2026-101302 · Other software · FreeBSD · reported by secteam@freebsd.orgMedium 6.5
TLS 1.3 embeds the actual record type as the last non-zero byte of the decrypted payload, optionally followed by zero padding. The code which searches for the inner record type had an off-by-one bug which could be triggered by an invalid frame, leading to an underflow followed by an unconditional NULL pointer dereference, causing a kernel panic. A remote TLS 1.3 peer can send a specially crafted record to trigger a kernel panic, resulting in a Denial of Service (DoS).
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 14, 2026Nix before 2.35.3, when unsandboxed on macOS or FreeBSD, incorrectly allows connections made by build users from daemon clients.CVE-2026-110453 · Other software · NixOS · reported by MITREMedium 4.3
Nix before 2.35.3, when unsandboxed on macOS or FreeBSD, incorrectly allows connections made by build users from daemon clients.
- Product
- Nix
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Sep 21, 2026Ansible FreeBSD Jail Connection Plugin is an Ansible connection plugin for FreeBSD Jails via jexec.CVE-2026-55074 · Other software · chofstede · reported by GitHubHigh 8.2
Ansible FreeBSD Jail Connection Plugin is an Ansible connection plugin for FreeBSD Jails via jexec. Through version 1.3.0, the jailexec connection plugin's put_file resolved a transfer's destination to a path on the jail host ( + ) and ran mkdir -p and mv there as root on the host. Those commands follow symbolic links, and the path was operated on outside the jail, so a symlink existing inside the jail was followed by the host-side, root-privileged mv. A party controlling content inside a managed jail (the jail's root, or any process able to create a symlink in a directory an Ansible task later writes to) can therefore cause an arbitrary root-owned write on the host, outside the jail — a full jail escape. Arbitrary root-owned host writes are readily escalated to host compromise (e.g. cron, rc.d, authorized_keys). Preconditions for this vulnerability are that the operator runs a copy/template/fetch-style task (anything using put_file) against the jail, and the attacker can place a symlink inside the jail at or above the task's destination before the transfer runs. This issue has been fixed in version 2.0.0.
- Product
- ansible_jailexec
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Sep 8, 2026OPNsense is a FreeBSD based firewall and routing platform.CVE-2026-53581 · Other software · opnsense · reported by GitHubCritical 9
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.9 of opnsense/core and version 26.4_20 of BE/opnsense/core, a path traversal vulnerability in the NTP configuration module allows an attacker to overwrite arbitrary files on the system as the root user. By manipulating the GPS or PPS serial port parameter, an attacker with access to the NTP configuration can escape the intended directory and force the system to write user-controlled data to any file on the filesystem. Version 26.1.9 of opnsense/core and version 26.4_20 of BE/opnsense/core patch the issue.
- Product
- core
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2026mp_SetEnddisc() copied a user-supplied PSN endpoint value without length validation, allowing a buffer overflow via the ppp(8) command interface.CVE-2026-58097 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.8
mp_SetEnddisc() copied a user-supplied PSN endpoint value without length validation, allowing a buffer overflow via the ppp(8) command interface. A local user with access to the ppp(8) command interface can crash ppp(8) or potentially execute arbitrary code as root.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2026LcpDecodeConfig() did not validate the length of received endpoint discriminator options against the minimum required by RFC 1717.CVE-2026-58096 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 8.8
LcpDecodeConfig() did not validate the length of received endpoint discriminator options against the minimum required by RFC 1717. Undersized options would trigger an out-of-bounds write. A malicious PPP peer can exploit CVE-2026-58095 and CVE-2026-58096 to crash ppp(8) or potentially execute arbitrary code as root.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2026mp_Enddisc() used incorrect length calculations when formatting endpoint discriminator addresses for display, allowing a received endpoint option to overflow a CVE-2026-58095 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 8.8
mp_Enddisc() used incorrect length calculations when formatting endpoint discriminator addresses for display, allowing a received endpoint option to overflow a global result buffer. A malicious PPP peer can crash ppp(8) or potentially execute arbitrary code as root.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2026The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object.CVE-2026-58094 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.8
The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object. This is intended to be used immediately after creating the object, before any memory is allocated for the object. The handler checked whether a page size had already been configured without holding the rangelock. Two concurrent callers could both observe an unconfigured object and set conflicting page sizes, leaving the object in an inconsistent state. An unprivileged local user can exploit this race to escalate privileges.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2026The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock.CVE-2026-58093 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7
The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring the tty lock, the handler did not revalidate the state of the terminal, and could proceed to link a terminal that was concurrently being destroyed to the calling process' session. An unprivileged local user can exploit this race condition to escalate privileges.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2026In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group ID was stored in the first element of the array cCVE-2026-58092 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 8.1
In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group ID was stored in the first element of the array containing the list of supplementary group IDs, whereas now the primary group ID is stored in a dedicated field. This change was largely internal to the kernel and not user-visible. One function, group_is_primary(), was not properly updated as a part of this transition. This function is used by mac_do to determine the primary group ID of the credential after applying a transition rule, used when the rule target does not explicitly specify a group. As a result, with certain mac_do rules, it is possible for a credential switch to incorrectly set the primary group ID to the ID stored in the first element of the original credential's supplementary group array. If the list of supplementary groups is empty, this value will be 0, corresponding to the "wheel" group. For example, a rule such as "uid=1001>uid=1002" can be abused to set the primary group ID to 0 even if the process did not originally belong to group 0. Certain mac_do rules can be abused to set a process' group ID to 0. Note however, that the rule must apply to
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2026The implementation of this ioctl attempts to acquire locks on all channels in a sync group.CVE-2026-58091 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.8
The implementation of this ioctl attempts to acquire locks on all channels in a sync group. If locking a channel would block, it releases the sync group list lock and sleeps. Upon reawakening, it is possible that the sync group structure is freed, but the implementation did not handle this possibility. On a system with a multiple audio devices, an unprivileged local user can exploit this use-after-free to escalate privileges.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2026The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from the socket buffer before processing them.CVE-2026-58090 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.8
The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from the socket buffer before processing them. Some error paths would free those messages, leaving freed data mbufs in the receive socket buffer. An unprivileged local user can exploit this use-after-free to escalate privileges.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 26, 2026When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned by unprivileged processes.CVE-2026-58089 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.8
When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned by unprivileged processes. An inverted check meant that this scenario was not handled properly. An unprivileged local user who has attached PMCs to a process can continue monitoring it after the process executes a setuid or setgid binary, contrary to the intended policy.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026The ELF core dump code counted the number of dumpable VM map entries, allocated a buffer for the corresponding program headers, then iterated over the map a secCVE-2026-58088 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.4
The ELF core dump code counted the number of dumpable VM map entries, allocated a buffer for the corresponding program headers, then iterated over the map a second time to populate them. A process sharing the address space via rfork(2) can mutate the map between the two passes, causing the second pass to write program headers past the end of the buffer. An unprivileged local user sharing an address space with a process that dumps core can trigger an out-of-bounds write on the kernel heap, potentially leading to privilege escalation.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026The GETALL and SETALL commands in semctl(2) recorded the number of semaphores in the target set, dropped the lock protecting the set, allocated a buffer sized fCVE-2026-58087 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.8
The GETALL and SETALL commands in semctl(2) recorded the number of semaphores in the target set, dropped the lock protecting the set, allocated a buffer sized for that count, and reacquired the lock. A sequence-number check was used to verify that the set had not been replaced in the interim, but the sequence number wraps after 0x8000 create/destroy cycles. By rapidly destroying and recreating semaphore sets at the same index, another process can cause the sequence number to wrap, allowing a set with a different number of semaphores to pass validation. The subsequent copy then reads or writes past the end of the allocated buffer. An unprivileged local user can trigger out-of-bounds reads and writes on kernel heap memory, potentially leading to privilege escalation.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user.CVE-2026-58086 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 8.1
As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user. Tracing configured by a jailed root user was therefore not flagged as privileged. An unprivileged user in a jail that has permission to debug the target process can modify the jailed root user's ktrace(2) flags, or disable tracing outright. A jailed root user therefore cannot reliably trace unprivileged processes.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026After dispatching a decrypt operation to OCF and receiving the result, the wg(4) driver failed to check whether the MAC verification step succeeded.CVE-2026-58085 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.5
After dispatching a decrypt operation to OCF and receiving the result, the wg(4) driver failed to check whether the MAC verification step succeeded. The driver thus silently accepted packets with an invalid Poly1305 authentication tag. A remote attacker who can send UDP packets to a WireGuard endpoint, and who can guess the bounds of the receiver's replay window, can inject forged or modified transport data packets into the tunnel. A remote attacker who can intercept WireGuard packets bound for a FreeBSD host can modify the ciphertext and authenticated data without detection by the receiver.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026To retrieve the previous timer value, the kernel calls realtimer_gettime(), which obtains the current time for the timer's clock.CVE-2026-58084 · Other software · FreeBSD · reported by secteam@freebsd.orgMedium 5.5
To retrieve the previous timer value, the kernel calls realtimer_gettime(), which obtains the current time for the timer's clock. For a timer using CLOCK_TAI this can fail when no TAI offset has been configured, but the error return was not checked, so the uninitialized output buffer was copied to userspace. An unprivileged local user can obtain uninitialized kernel stack memory by creating a POSIX timer with CLOCK_TAI and calling timer_settime(2), potentially disclosing sensitive kernel data.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026While the kernel was copying knotes during fork, a knote with a timer-based filter could fire and be enqueued on the kqueue's active list before the copy was coCVE-2026-58083 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 8.4
While the kernel was copying knotes during fork, a knote with a timer-based filter could fire and be enqueued on the kqueue's active list before the copy was complete. The copy routine did not account for this and could enqueue the new knote a second time, corrupting the active list. In addition, the copy routine did not hold the appropriate locks while reading knote state, allowing further races. An unprivileged local user can trigger a use-after-free in the kernel, potentially leading to privilege escalation.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026The ISO-2022 encoding module used a stack buffer sized to MB_LEN_MAX (6 bytes) for intermediate character output.CVE-2026-58082 · Other software · FreeBSD · reported by secteam@freebsd.orgCritical 9.8
The ISO-2022 encoding module used a stack buffer sized to MB_LEN_MAX (6 bytes) for intermediate character output. Some ISO-2022 variants can require up to 10 bytes per character, in which case conversions can trigger a stack buffer overflow of up to four bytes. An application that uses iconv(3) to convert untrusted input to or from one of the affected encodings may be vulnerable to buffer overflows if it uses one of the affected encoding modules.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026Several encoding modules, including HZ, UTF-7, VIQR, and ZW, did not properly check the size of the caller-supplied output buffer before writing converted charaCVE-2026-58081 · Other software · FreeBSD · reported by secteam@freebsd.orgCritical 9.8
Several encoding modules, including HZ, UTF-7, VIQR, and ZW, did not properly check the size of the caller-supplied output buffer before writing converted characters. An application that uses iconv(3) to convert untrusted input to or from one of the affected encodings may be vulnerable to buffer overflows if it uses one of the affected encoding modules.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026The compat32 kevent() handler translates a 64-bit kevent struct into a stack- declared 32-bit struct.CVE-2026-49425 · Other software · FreeBSD · reported by secteam@freebsd.orgMedium 5.5
The compat32 kevent() handler translates a 64-bit kevent struct into a stack- declared 32-bit struct. It did not first zero the stack struct. An unprivileged user may observe a small amount of uninitialized kernel stack data, which may contain sensitive information.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026The Linux waitid() implementation translates a FreeBSD siginfo_t struct into a stack-declared Linux siginfo_t.CVE-2026-49424 · Other software · FreeBSD · reported by secteam@freebsd.orgMedium 5.5
The Linux waitid() implementation translates a FreeBSD siginfo_t struct into a stack-declared Linux siginfo_t. It did not first zero the stack struct. An unprivileged user may observe 104 bytes of uninitialized kernel stack data, which may contain sensitive information.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026When building the iovec array for a received TLS 1.2 CBC record, ktls_ocf_tls_cbc_decrypt() incremented the iovec index for every mbuf in the chain, including mCVE-2026-49423 · Other software · FreeBSD · reported by secteam@freebsd.orgLow 3.3
When building the iovec array for a received TLS 1.2 CBC record, ktls_ocf_tls_cbc_decrypt() incremented the iovec index for every mbuf in the chain, including mbufs that were skipped because they contained only TLS header bytes. This left uninitialized entries in the iovec array. The iovec array was allocated without zeroing. A remote TLS peer can cause the kernel to read from uninitialized iovec entries during HMAC computation, resulting in a kernel panic. The peer must be able to control TCP segmentation such that the first mbuf of a CBC record contains only the 5-byte TLS record header.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026The ZFS_IOC_SET_PROP ioctl, used by zfs-set(8), incorrectly validated the calling user such that an unprivileged user is able to set metadata on a dataset indicCVE-2026-49431 · Other software · FreeBSD · reported by secteam@freebsd.orgLow 3.3
The ZFS_IOC_SET_PROP ioctl, used by zfs-set(8), incorrectly validated the calling user such that an unprivileged user is able to set metadata on a dataset indicating that the dataset has received properties from a zfs-recv(8) stream. Any local user can set the internal ZFS metadata flag "$hasrecvd" on datasets via ZFS_IOC_SET_PROP.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026The ZFS_IOC_RECV_NEW ioctl, in the heal receive path, similarly truncated a 64-bit payload size to a 32-bit integer for allocation, then used the original 64-biCVE-2026-49430 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.8
The ZFS_IOC_RECV_NEW ioctl, in the heal receive path, similarly truncated a 64-bit payload size to a 32-bit integer for allocation, then used the original 64-bit size as the length for a byteswap operation. A local user with the "receive" delegated ZFS permission can trigger kernel memory corruption via ZFS_IOC_RECV_NEW by sending a crafted receive stream in heal mode.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026The ZFS_IOC_USERSPACE_MANY ioctl, used by zfs-userspace(8), truncated a 64-bit output buffer size to a 32-bit integer for the kernel allocation, but used the orCVE-2026-49429 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 7.8
The ZFS_IOC_USERSPACE_MANY ioctl, used by zfs-userspace(8), truncated a 64-bit output buffer size to a 32-bit integer for the kernel allocation, but used the original 64-bit size as the buffer limit when writing records. A local user with the "userused" delegated ZFS permission can trigger a kernel heap overflow via the ZFS_IOC_USERSPACE_MANY ioctl, potentially escalating privileges.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 19, 2026Certain system calls, such open(2) with the O_TRUNC flag set, and fspacectl(2), could incorrectly free memory in largepage objects.CVE-2026-49428 · Other software · FreeBSD · reported by secteam@freebsd.orgHigh 8.4
Certain system calls, such open(2) with the O_TRUNC flag set, and fspacectl(2), could incorrectly free memory in largepage objects. These operations are not permitted on largepage objects, but the implementation did not verify this. An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.
- Product
- FreeBSD
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
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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