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CVE-2023-43787

Libx11: integer overflow in xcreateimage() leading to a heap overflow

A vulnerability was found in libX11 due to an integer overflow within the XCreateImage() function. This flaw allows a local user to trigger an integer overflow and execute arbitrary code with elevated privileges.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Fedoraproject Redhat X.org
Products
Fedora Enterprise Linux Rhel Els and 1 more
CVE-2023-43785

Libx11: out-of-bounds memory access in _xkbreadkeysyms()

A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function. This flaw allows a local user to trigger an out-of-bounds read error and read the contents of memory on the system.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Fedoraproject Redhat X.org
Products
Fedora Enterprise Linux Rhel Els and 1 more
CVE-2023-43786

Libx11: stack exhaustion from infinite recursion in putsubimage()

A vulnerability was found in libX11 due to an infinite loop within the PutSubImage() function. This flaw allows a local user to consume all available system resources and cause a denial of service condition.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Fedoraproject Redhat X.org
Products
Fedora Enterprise Linux Rhel Els and 1 more
CVE-2026-94285

Out-of-bounds read in libX11's byte-oriented codeset parser

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.

CVSS 3.1 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
X.org
Products
Libx11
CVE-2026-94284

Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser

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.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
X.org
Products
Libx11
CVE-2026-94283

Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser

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.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
X.org
Products
Libx11
CVE-2026-88806

libX11 XkbGetMap Reply Heap-based Buffer Overflow

A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
X.org
Products
Libx11
CVE-2006-5397

CVE-2006-5397 libX11 file descriptor leak

The Xinput module (modules/im/ximcp/imLcIm.c) in X.Org libX11 1.0.2 and 1.0.3 opens a file for reading twice using the same file descriptor, which causes a file descriptor leak that allows local users to read files specified by the XCOMPOSEFILE environment variable via the duplicate file descriptor.

CVSS 2.0 · 2.1 Low EPSS < 1% KEV · Not listed
Vendors
X.org
Products
Libx11
CVE-2007-1667

XGetPixel() integer overflow

Multiple integer overflows in (1) the XGetPixel function in ImUtil.c in X.Org libx11 before 1.0.3, and (2) XInitImage function in xwd.c for ImageMagick, allow user-assisted remote attackers to cause a denial of service (crash) or obtain sensitive information via crafted images with large or negative values that trigger a buffer overflow.

CVSS 2.0 · 9.3 Critical EPSS 4.8% KEV · Not listed
Vendors
Canonical Debian Redhat and 1 more
Products
Ubuntu Linux Debian Linux Enterprise Linux and 1 more
CVE-2016-7943

libX11: Insufficient validation of server responses in FontNames

The XListFonts function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving length fields, which trigger out-of-bounds write operations.

CVSS 3.0 · 9.8 Critical EPSS 4.5% KEV · Not listed
Vendors
Fedoraproject X.org
Products
Fedora Libx11
CVE-2013-7439

libX11: buffer overflow in MakeBigReq macro

Multiple off-by-one errors in the (1) MakeBigReq and (2) SetReqLen macros in include/X11/Xlibint.h in X11R6.x and libX11 before 1.6.0 allow remote attackers to have unspecified impact via a crafted request, which triggers a buffer overflow.

CVSS 2.0 · 7.5 High EPSS 4.3% KEV · Not listed
Vendors
Canonical Debian Redhat and 1 more
Products
Ubuntu Linux Debian Linux Enterprise Linux and 2 more
CVE-2016-7942

libX11: Insufficient validation of server responses in XGetImage()

The XGetImage function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving image type and geometry, which triggers out-of-bounds read operations.

CVSS 3.0 · 9.8 Critical EPSS 4.5% KEV · Not listed
Vendors
Fedoraproject X.org
Products
Fedora Libx11
CVE-2023-3138

libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request leads to a buffer overflow

A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.

CVSS 3.1 · 7.5 High EPSS 1.7% KEV · Not listed
Vendors
Redhat X.org
Products
Enterprise Linux Rhel Eus Libx11
CVE-2021-31535

libX11: missing request length checks

LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. The libX11 XLookupColor request (intended for server-side color lookup) contains a flaw allowing a client to send color-name requests with a name longer than the maximum size allowed by the protocol (and also longer than the maximum packet size for normal-sized packets). The user-controlled data exceeding the maximum size is then interpreted by the server as additional X protocol requests and executed, e.g., to disable X server authorization completely. For example, if the victim encounters malicious terminal control sequences for color codes, then the attacker may be able to take full control of the running graphical session.

CVSS 3.1 · 9.8 Critical EPSS 10.4% KEV · Not listed
Vendors
Fedoraproject Redhat X.org
Products
Fedora Ansible Automation Platform Enterprise Linux and 2 more
CVE-2020-14363

libX11: integer overflow leads to double free in locale handling

An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as system availability.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Fedoraproject Redhat X.org
Products
Fedora Enterprise Linux Libx11
CVE-2020-14344

libX11: Heap overflow in the X input method client

An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was implemented in libX11 before version 1.6.10. As per upstream this is security relevant when setuid programs call XIM client functions while running with elevated privileges. No such programs are shipped with Red Hat Enterprise Linux.

CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical Fedoraproject Opensuse and 2 more
Products
Ubuntu Linux Fedora Leap and 2 more
CVE-2018-14600

libX11: Out of Bounds write in XListExtensions in ListExt.c

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.

CVSS 3.1 · 8.1 High EPSS 9.2% KEV · Not listed
Vendors
Canonical Debian Redhat and 1 more
Products
Ubuntu Linux Debian Linux Enterprise Linux and 1 more
CVE-2018-14599

libX11: Off-by-one error in XListExtensions in ListExt.c

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c is vulnerable to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other impact.

CVSS 3.1 · 9.8 Critical EPSS 4.2% KEV · Not listed
Vendors
Canonical Debian Fedoraproject and 2 more
Products
Ubuntu Linux Debian Linux Fedora and 5 more
CVE-2018-14598

libX11: Crash on invalid reply in XListExtensions in ListExt.c

An issue was discovered in XListExtensions in ListExt.c in libX11 through 1.6.5. A malicious server can send a reply in which the first string overflows, causing a variable to be set to NULL that will be freed later on, leading to DoS (segmentation fault).

CVSS 3.0 · 7.5 High EPSS 4.2% KEV · Not listed
Vendors
Canonical Debian Fedoraproject and 2 more
Products
Ubuntu Linux Debian Linux Fedora and 2 more