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

344new WordPress flaws this week

390,080entries in the database

263 results · page 1 of 6

Oct 28, 2026A use after free caused by missing lifecycle management of gesture sprites in GestureBuildSprite() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 CVE-2026-93536 · Other software · x.org · reported by meissner@suse.deMedium 5.3
A use after free caused by missing lifecycle management of gesture sprites in GestureBuildSprite() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash the X server or potentially execute code.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts CVE-2026-93524 · Other software · x.org · reported by meissner@suse.deMedium 6.9
A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026A heap buffer overflow caused by a XIPassiveUngrabDevice request with an out-of-range modifier value in X.Org X Server before 21.1.15 and XWayland before 24.1.1CVE-2026-93523 · Other software · x.org · reported by meissner@suse.deHigh 7.8
A heap buffer overflow caused by a XIPassiveUngrabDevice request with an out-of-range modifier value in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026A heap buffer overflow caused by mismatched size usage in CopyArea CPU-to-FBO path in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used byCVE-2026-93522 · Other software · x.org · reported by meissner@suse.deHigh 7.8
A heap buffer overflow caused by mismatched size usage in CopyArea CPU-to-FBO path in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in the X server context.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026A buffer overflow in RandR ChangeProviderProperty requests in X.Org X Server before 2.1.25 and XWayland before 24.4.14 could be used by authenticated X clients CVE-2026-93521 · Other software · x.org · reported by meissner@suse.deHigh 7.8
A buffer overflow in RandR ChangeProviderProperty requests in X.Org X Server before 2.1.25 and XWayland before 24.4.14 could be used by authenticated X clients to crash or execute code within the X server context.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland beforeCVE-2026-93520 · Other software · x.org · reported by meissner@suse.deHigh 7.8
A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026A buffer overflow when handling pointer barriers in the XFIXES extension in X.Org X server before 21.1.25 and XWayland before 24.1.14 could be used by authenticCVE-2026-93519 · Other software · x.org · reported by meissner@suse.deHigh 7.8
A buffer overflow when handling pointer barriers in the XFIXES extension in X.Org X server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026An integer truncation issue in XkbResizeKeyType() that could lead to a heap buffer overflow by authenticated X clients in X.org X server before 21.1.25 and XWayCVE-2026-93518 · Other software · x.org · reported by meissner@suse.deHigh 7.8
An integer truncation issue in XkbResizeKeyType() that could lead to a heap buffer overflow by authenticated X clients in X.org X server before 21.1.25 and XWayland before 24.1.14 could be exploited for crashes or potential code execution in the X server.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that coulCVE-2026-93517 · Other software · x.orgg · reported by meissner@suse.deHigh 8.5
A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execution in X server context.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026A use-after-free caused by lack of lifecycle management when adding / removing XInput master devices in X.org X Server before 21.1.25 and XWayland before 24.1.1CVE-2026-93516 · Other software · x.org · reported by meissner@suse.deMedium 5.5
A use-after-free caused by lack of lifecycle management when adding / removing XInput master devices in X.org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X Clients to crash the X server or potentially execute code in X server context.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 28, 2026A use-after-free in present_clear_window_notifies() in the X.org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by malicious X clients to cCVE-2026-93515 · Other software · X.org · reported by meissner@suse.deMedium 6.8
A use-after-free in present_clear_window_notifies() in the X.org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by malicious X clients to crash or potentially execute code in the X server context.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 27, 2026A double free in XKB SetGeometryin X.Org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by attached clients to cause a crash or potentially CVE-2026-88812 · Other software · X.org · reported by meissner@suse.deHigh 7.8
A double free in XKB SetGeometryin X.Org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by attached clients to cause a crash or potentially code in the x server context.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 27, 2026A malicious X server could cause a heap overflow by injecting a large DEVICE_ENABLE reply when processed by libXi before 1.8.4.CVE-2026-109090 · Other software · x.org · reported by meissner@suse.deHigh 7.5
A malicious X server could cause a heap overflow by injecting a large DEVICE_ENABLE reply when processed by libXi before 1.8.4.
Product
libXi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 27, 2026A buffer overflow when handling DEVICE_RESOLUTION in libXi before 1.8.4 could overflow a heap, triggered by a malicious X server.CVE-2026-109089 · Other software · X.Org · reported by meissner@suse.deHigh 7.5
A buffer overflow when handling DEVICE_RESOLUTION in libXi before 1.8.4 could overflow a heap, triggered by a malicious X server.
Product
libXi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Oct 27, 2026A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst beforeCVE-2026-109088 · Other software · X.org · reported by meissner@suse.deMedium 6.5
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
Product
libXtst
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 28, 2026A denial of service via unsigned underflow in libXpm's write path in libXpm before 3.5.19 could be used by local attackers to cause unbounded CPU usage and memoCVE-2026-94287 · Other software · x.org · reported by meissner@suse.deMedium 5.5
A denial of service via unsigned underflow in libXpm's write path in libXpm before 3.5.19 could be used by local attackers to cause unbounded CPU usage and memory exhaustion.
Product
libXpm
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 28, 2026An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6 could be used by malicious X servers to crash attached X clients.CVE-2026-94286 · Other software · x.org · reported by meissner@suse.deHigh 7.1
An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6 could be used by malicious X servers to crash attached X clients.
Product
libXtst
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 28, 2026An out-of-bounds read in libX11's byte-oriented codeset parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.CVE-2026-94285 · Other software · x.org · reported by meissner@suse.deMedium 5.1
An out-of-bounds read in libX11's byte-oriented codeset parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.
Product
libX11
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 28, 2026An out-of-bounds read vulnerability in libX11's XIM trigger-key registration parser in libX11 before 1.8.14 could be used by malicious X servers to crash attachCVE-2026-94284 · Other software · x.org · reported by meissner@suse.deMedium 5.5
An out-of-bounds read vulnerability in libX11's XIM trigger-key registration parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.
Product
libX11
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 28, 2026An out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser in libX11 before 1.8.14 could be used by malicious X servers to crash attaCVE-2026-94283 · Other software · x.org · reported by meissner@suse.deMedium 6.5
An out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.
Product
libX11
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 28, 2026An out-of-bounds read in libXi's XI2 enter/leave/focus cookie conversion in libXi before 1.8.4 could be used by malicious X server to crash an attached X clientCVE-2026-94282 · Other software · x.org · reported by meissner@suse.deMedium 5.6
An out-of-bounds read in libXi's XI2 enter/leave/focus cookie conversion in libXi before 1.8.4 could be used by malicious X server to crash an attached X client.
Product
libXi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 24, 2026An out-of-bounds read in libXi's XListInputDevices() class parsing in libXi before 1.8.4 could be used by malicious X servers to crash an attached X client.CVE-2026-94281 · Other software · x.org · reported by meissner@suse.deMedium 6.5
An out-of-bounds read in libXi's XListInputDevices() class parsing in libXi before 1.8.4 could be used by malicious X servers to crash an attached X client.
Product
libXi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 24, 2026An out-of-bounds read in libXi's XListInputDevices() in libXi before 1.8.4 could be used by malicious X servers to crash an attached X client.CVE-2026-93545 · Other software · x.org · reported by meissner@suse.deMedium 6.5
An out-of-bounds read in libXi's XListInputDevices() in libXi before 1.8.4 could be used by malicious X servers to crash an attached X client.
Product
libXi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 24, 2026An out-of-bounds read in libXi's XI2 XIQueryDevice reply parsing in libXi before 1.8.4 can be used by a malicious X server to crash an attached X client.CVE-2026-93544 · Other software · x.org · reported by meissner@suse.deMedium 6.5
An out-of-bounds read in libXi's XI2 XIQueryDevice reply parsing in libXi before 1.8.4 can be used by a malicious X server to crash an attached X client.
Product
libXi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 24, 2026An out-of-bounds read in libXi's XI2 class parser in libXi before 1.8.4 could be used by malicious X servers to crash an attached X client.CVE-2026-93543 · Other software · x.org · reported by meissner@suse.deHigh 7.4
An out-of-bounds read in libXi's XI2 class parser in libXi before 1.8.4 could be used by malicious X servers to crash an attached X client.
Product
libXi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 24, 2026An out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before 1.8.4 could be used by malicous servers to crash the X CVE-2026-93542 · Other software · x.org · reported by meissner@suse.deMedium 6.5
An out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before 1.8.4 could be used by malicous servers to crash the X client.
Product
libXi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 24, 2026An out-of-bounds read in libXi's XQueryDeviceState() in libXi before 1.8.4 could be used by aCVE-2026-93541 · Other software · X.org · reported by meissner@suse.deMedium 6.5
An out-of-bounds read in libXi's XQueryDeviceState() in libXi before 1.8.4 could be used by a
Product
libXi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 22, 2026The open-vsx.org deployment returned Access-Control-Allow-Origin reflecting the requesting origin together with Access-Control-Allow-Credentials: true on the auCVE-2026-90882 · Other software · Eclipse Foundation · reported by emo@eclipse.orgHigh 8.7
The open-vsx.org deployment returned Access-Control-Allow-Origin reflecting the requesting origin together with Access-Control-Allow-Credentials: true on the authenticated /user/ endpoints. A page on any origin could therefore issue credentialed requests to the service in a logged-in user's browser and read the responses. This exposed /user (login name, avatar, homepage, tokens URL), /user/tokens, /user/namespaces, /user/extensions, /user/search/{name} and /user/namespace/{name}/members, and — because /user/csrf was readable the same way — allowed the CSRF protection on write endpoints to be defeated. Chaining the two, an attacker page could call /user/token/create and exfiltrate a personal access token carrying publish and delete rights over the victim's namespaces. The headers were emitted by the CDN/edge layer, not by the application: the Open VSX software sets allowCredentials(true) in exactly one place, against a single exact origin derived from ovsx.webui.url, and defines no CORS mapping on /user/ beyond it. No configuration of the software produces origin reflection with credentials.
Product
open-vsx.org
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.eclipse.org
Sep 21, 2026A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients.CVE-2026-88807 · Other software · X.org · reported by meissner@suse.deHigh 8.9
A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients.
Product
libXrender
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Sep 21, 2026A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.CVE-2026-88806 · Other software · x.org · reported by meissner@suse.deHigh 7.5
A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.
Product
libX11
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org
Jul 8, 2026A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 beforeCVE-2026-56003 · Other software · X.Org · reported by meissner@suse.deHigh 8.5
A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.
Product
libXfont2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org openwall.com
Jul 8, 2026A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code wiCVE-2026-56002 · Other software · X.Org · reported by meissner@suse.deHigh 8.5
A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.
Product
libXfont2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org openwall.com
Jul 8, 2026A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server tCVE-2026-56001 · Other software · X.Org · reported by meissner@suse.deHigh 8.5
A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont
Product
libXfont2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org openwall.com
Jul 8, 2026Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use AftCVE-2026-56000 · Other software · X.Org · reported by meissner@suse.deCritical 9
Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.
Product
xorg-x11-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org openwall.com
Jul 8, 2026Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap bufferCVE-2026-55999 · Other software · X.Org · reported by meissner@suse.deHigh 8.5
Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.
Product
xorg-server
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org openwall.com
Jun 5, 2026An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat.CVE-2026-50264 · Other software · Red Hat · reported by Red HatHigh 7.8
An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger an out-of-bounds heap write. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Jun 5, 2026A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow().CVE-2026-50263 · Other software · Red Hat · reported by Red HatMedium 5.5
A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Jun 5, 2026An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes().CVE-2026-50262 · Other software · Red Hat · reported by Red HatMedium 5.5
An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Jun 5, 2026A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter().CVE-2026-50261 · Other software · Red Hat · reported by Red HatHigh 7.8
A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Jun 5, 2026A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter().CVE-2026-50260 · Other software · Red Hat · reported by Red HatHigh 7.8
A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Jun 5, 2026A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland.CVE-2026-50259 · Other software · Red Hat · reported by Red HatHigh 7.8
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Jun 5, 2026A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland.CVE-2026-50258 · Other software · Red Hat · reported by Red HatHigh 7.8
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an incomplete fix of CVE-2025-26597. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Jun 5, 2026A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence().CVE-2026-50257 · Other software · Red Hat · reported by Red HatHigh 7.8
A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Jun 5, 2026A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland.CVE-2026-50256 · Other software · Red Hat · reported by Red HatHigh 7.8
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library's maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2's alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
May 5, 2026A flaw was found in the X.Org X server.CVE-2026-34002 · Other software · Red Hat · reported by Red HatMedium 6.1
A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.
Product
Red Hat Enterprise Linux 10.0 Extended Update Support
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
May 5, 2026A flaw was found in the X.Org X server.CVE-2026-34000 · Other software · Red Hat · reported by Red HatMedium 6.1
A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.
Product
Red Hat Enterprise Linux 10.0 Extended Update Support
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Apr 23, 2026A flaw was found in the X.Org X server's XKB key types request validation.CVE-2026-34003 · Other software · Red Hat · reported by Red HatHigh 7.8
A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial of Service (DoS). In certain configurations, higher impact outcomes may be possible.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Apr 23, 2026A flaw was found in the X.Org X server.CVE-2026-34001 · Other software · Red Hat · reported by Red HatHigh 7.8
A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Apr 23, 2026A flaw was found in the X.Org X server.CVE-2026-33999 · Other software · Red Hat · reported by Red HatHigh 7.8
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Dec 17, 2025A vulnerability exists in NGINX Ingress Controller's nginx.org/rewrite-target annotation validation.CVE-2025-14727 · Network & remote access · F5 · reported by f5sirt@f5.comHigh 8.7
A vulnerability exists in NGINX Ingress Controller's nginx.org/rewrite-target annotation validation. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Product
NGINX Ingress Controller
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record my.f5.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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