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CVE-2026-88806

libX11 XkbGetMap Reply Heap-based Buffer Overflow

7.5 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.20%Unchanged since Sep 22, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

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.

Record
CVE-2026-88806
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-02
EUVDEUVD-2026-83914 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.

Record
EUVD-2026-83914
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-xrgw-w7v2-3qp8 7.5

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

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

Record
GHSA-xrgw-w7v2-3qp8
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-02
NVD 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.

Record
CVE-2026-88806
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-02
OSVALPINE-CVE-2026-88806 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.

Record
ALPINE-CVE-2026-88806
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVBELL-CVE-2026-88806 7.5
Record
BELL-CVE-2026-88806
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-04
Show 31 moreShow less
OSV 7.5

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.

Record
CVE-2026-88806
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-07
OSVDEBIAN-CVE-2026-88806 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.

Record
DEBIAN-CVE-2026-88806
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2026-4247 7.5

libX11 security update

Core X11 protocol client library.

Security Fix(es):

A 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)

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.(CVE-2026-94283)

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.(CVE-2026-94284)

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.(CVE-2026-94285)

Record
OESA-2026-4247
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2026-4248 7.5

libX11 security update

Core X11 protocol client library.

Security Fix(es):

A 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)

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.(CVE-2026-94283)

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.(CVE-2026-94284)

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.(CVE-2026-94285)

Record
OESA-2026-4248
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2026-4249 7.5

libX11 security update

Core X11 protocol client library.

Security Fix(es):

A 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)

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.(CVE-2026-94283)

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.(CVE-2026-94284)

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.(CVE-2026-94285)

Record
OESA-2026-4249
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2026-4250 7.5

libX11 security update

Core X11 protocol client library.

Security Fix(es):

A 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)

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.(CVE-2026-94283)

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.(CVE-2026-94284)

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.(CVE-2026-94285)

Record
OESA-2026-4250
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRLSA-2026:89730 7.5

Important: libX11 security update

The libX11 packages contain the core X11 protocol client library.

Security Fix(es):

  • libX11: libX11: Heap-based buffer overflow via malicious X server (CVE-2026-88806)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:89730
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRLSA-2026:91365 7.5

Important: libX11 security update

The libX11 packages contain the core X11 protocol client library.

Security Fix(es):

  • libX11: libX11: Heap-based buffer overflow via malicious X server (CVE-2026-88806)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:91365
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRLSA-2026:91366 7.5

Important: libX11 security update

The libX11 packages contain the core X11 protocol client library.

Security Fix(es):

  • libX11: libX11: Heap-based buffer overflow via malicious X server (CVE-2026-88806)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:91366
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-88806 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.

Record
UBUNTU-CVE-2026-88806
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVALSA-2026:89730 No score

Important: libX11 security update

The libX11 packages contain the core X11 protocol client library.

Security Fix(es):

  • libX11: libX11: Heap-based buffer overflow via malicious X server (CVE-2026-88806)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:89730
Updated
2026-11-02
OSVALSA-2026:91365 No score

Important: libX11 security update

The libX11 packages contain the core X11 protocol client library.

Security Fix(es):

  • libX11: libX11: Heap-based buffer overflow via malicious X server (CVE-2026-88806)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:91365
Updated
2026-11-02
OSVALSA-2026:91366 No score

Important: libX11 security update

The libX11 packages contain the core X11 protocol client library.

Security Fix(es):

  • libX11: libX11: Heap-based buffer overflow via malicious X server (CVE-2026-88806)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:91366
Updated
2026-11-02
OSVAZL-103388 No score

CVE-2026-88806 affecting package libX11 for versions less than 1.8.14-1

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

Record
AZL-103388
Updated
2026-11-02
OSVCLSA-2026-1792810382 No score

libX11: Fix of CVE-2026-88806

  • CVE-2026-88806: check key action ranges in _XkbReadKeyActions()
Record
CLSA-2026-1792810382
Updated
2026-11-02
OSVCLSA-2026-1792810818 No score

libX11: Fix of CVE-2026-88806

  • CVE-2026-88806: check key action ranges in _XkbReadKeyActions()
Record
CLSA-2026-1792810818
Updated
2026-11-02
OSVMGASA-2026-0508 No score

Updated libx11 package fixes security vulnerabilities

libX11 XkbGetMap Reply Heap-based Buffer Overflow. (CVE-2026-88806) Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser. (CVE-2026-94283) Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser. (CVE-2026-94284) Out-of-bounds read in libX11's byte-oriented codeset parser. (CVE-2026-94285)

Record
MGASA-2026-0508
Updated
2026-11-02
OSVopenSUSE-SU-2026:11833-1 No score

libX11-6-1.8.13-2.1 on GA media

These are all security issues fixed in the libX11-6-1.8.13-2.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11833-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21908-1 No score

Security update for libX11

This update for libX11 fixes the following issue:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
Record
openSUSE-SU-2026:21908-1
Updated
2026-11-02
OSVROOT-OS-DEBIAN-12-CVE-2026-88806 No score

CVE-2026-88806 in libx11 - Patched by Root

Root has patched CVE-2026-88806 in the libx11 package for Root:Debian:12. Multiple fixed versions available.

Record
ROOT-OS-DEBIAN-12-CVE-2026-88806
Updated
2026-11-02
OSVROOT-OS-DEBIAN-13-CVE-2026-88806 No score

CVE-2026-88806 in libx11 - Patched by Root

Root has patched CVE-2026-88806 in the libx11 package for Root:Debian:13. Multiple fixed versions available.

Record
ROOT-OS-DEBIAN-13-CVE-2026-88806
Updated
2026-11-02
OSVSUSE-SU-2026:23885-1 No score

Security update for libX11

This update for libX11 fixes the following issue:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
Record
SUSE-SU-2026:23885-1
Updated
2026-11-02
OSVSUSE-SU-2026:23899-1 No score

Security update for libX11

This update for libX11 fixes the following issue:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
Record
SUSE-SU-2026:23899-1
Updated
2026-11-02
OSVSUSE-SU-2026:24365-1 No score

Security update for libX11

This update for libX11 fixes the following issues:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
  • CVE-2026-94283: Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser (bsc#1281653).
  • CVE-2026-94284: Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser (bsc#1281657).
  • CVE-2026-94285: Out-of-bounds read in libX11's byte-oriented codeset parser (bsc#1281661).
Record
SUSE-SU-2026:24365-1
Updated
2026-11-02
OSVSUSE-SU-2026:24472-1 No score

Security update for libX11

This update for libX11 fixes the following issue:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
Record
SUSE-SU-2026:24472-1
Updated
2026-11-04
OSVSUSE-SU-2026:24552-1 No score

Security update for libX11

This update for libX11 fixes the following issues:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
  • CVE-2026-94283: Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser (bsc#1281653).
  • CVE-2026-94284: Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser (bsc#1281657).
  • CVE-2026-94285: Out-of-bounds read in libX11's byte-oriented codeset parser (bsc#1281661).
Record
SUSE-SU-2026:24552-1
Updated
2026-11-07
OSVSUSE-SU-2026:4410-1 No score

Security update for libX11

This update for libX11 fixes the following issues:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
  • CVE-2026-94283: out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser (bsc#1281653).
  • CVE-2026-94284: out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser (bsc#1281657).
  • CVE-2026-94285: out-of-bounds read in libX11's byte-oriented codeset parser (bsc#1281661).
Record
SUSE-SU-2026:4410-1
Updated
2026-11-02
OSVSUSE-SU-2026:4500-1 No score

Security update for libX11

This update for libX11 fixes the following issues:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
  • CVE-2026-94283: out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser (bsc#1281653).
  • CVE-2026-94284: out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser (bsc#1281657).
  • CVE-2026-94285: out-of-bounds read in libX11's byte-oriented codeset parser (bsc#1281661).
Record
SUSE-SU-2026:4500-1
Updated
2026-11-02
OSVSUSE-SU-2026:4501-1 No score

Security update for libX11

This update for libX11 fixes the following issues:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
  • CVE-2026-94283: out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser (bsc#1281653).
  • CVE-2026-94284: out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser (bsc#1281657).
  • CVE-2026-94285: out-of-bounds read in libX11's byte-oriented codeset parser (bsc#1281661).
Record
SUSE-SU-2026:4501-1
Updated
2026-11-02
OSVSUSE-SU-2026:4502-1 No score

Security update for libX11

This update for libX11 fixes the following issues:

  • CVE-2026-88806: XkbGetMap Reply Heap-based Buffer Overflow (bsc#1280910).
  • CVE-2026-94283: out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser (bsc#1281653).
  • CVE-2026-94284: out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser (bsc#1281657).
  • CVE-2026-94285: out-of-bounds read in libX11's byte-oriented codeset parser (bsc#1281661).
Record
SUSE-SU-2026:4502-1
Updated
2026-11-02
OSVUSN-8913-1 No score

libx11 vulnerabilities

Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard map replies. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-88806)

It was discovered that libx11 incorrectly handled certain X Input Method (XIM) messages. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use these issues to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94283, CVE-2026-94284)

It was discovered that libx11 incorrectly handled converting certain multibyte text. An attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94285)

Record
USN-8913-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libx11
Alpine:v3.24
 before 1.8.14-r0
1.8.14-r0
libX11
AlmaLinux:8
 before 1.6.8-10.el8_10
1.6.8-10.el8_10
libX11-common
AlmaLinux:8
 before 1.6.8-10.el8_10
1.6.8-10.el8_10
libX11-devel
AlmaLinux:8
 before 1.6.8-10.el8_10
1.6.8-10.el8_10
libX11-xcb
AlmaLinux:8
 before 1.6.8-10.el8_10
1.6.8-10.el8_10
libX11
AlmaLinux:9
 before 1.8.12-1.el9_8.1
1.8.12-1.el9_8.1
libX11-common
AlmaLinux:9
 before 1.8.12-1.el9_8.1
1.8.12-1.el9_8.1
libX11-devel
AlmaLinux:9
 before 1.8.12-1.el9_8.1
1.8.12-1.el9_8.1
libX11-xcb
AlmaLinux:9
 before 1.8.12-1.el9_8.1
1.8.12-1.el9_8.1
libX11
AlmaLinux:10
 before 1.8.10-1.el10_2.1
1.8.10-1.el10_2.1
Show 70 moreShow less
Affected packages
PackageAffectedFixed
libX11-common
AlmaLinux:10
 before 1.8.10-1.el10_2.1
1.8.10-1.el10_2.1
libX11-devel
AlmaLinux:10
 before 1.8.10-1.el10_2.1
1.8.10-1.el10_2.1
libX11-xcb
AlmaLinux:10
 before 1.8.10-1.el10_2.1
1.8.10-1.el10_2.1
libX11
Azure Linux:3
 before 1.8.14-1
1.8.14-1
libx11
Alpaquita:23
 1.8.2-r0 up to 1.8.14-r0
1.8.14-r0
libx11
Alpaquita:25
 1.8.11-r0 up to 1.8.14-r0
1.8.14-r0
libx11
Alpaquita:stream
 1.8.2-r0 up to 1.8.14-r0
1.8.14-r0
libx11
BellSoft Hardened Containers:23
 1.8.2-r0 up to 1.8.14-r0
1.8.14-r0
libx11
BellSoft Hardened Containers:25
 1.8.11-r0 up to 1.8.14-r0
1.8.14-r0
libx11
BellSoft Hardened Containers:stream
 1.8.2-r0 up to 1.8.14-r0
1.8.14-r0
libX11
TuxCare:RHEL:7
 before 1.6.7-5.el7_9.tuxcare.els1
1.6.7-5.el7_9.tuxcare.els1
libX11-common
TuxCare:RHEL:7
 before 1.6.7-5.el7_9.tuxcare.els1
1.6.7-5.el7_9.tuxcare.els1
libX11-devel
TuxCare:RHEL:7
 before 1.6.7-5.el7_9.tuxcare.els1
1.6.7-5.el7_9.tuxcare.els1
libX11
TuxCare:OracleLinux:7
 before 1.6.7-5.el7_9.tuxcare.els1
1.6.7-5.el7_9.tuxcare.els1
libX11-common
TuxCare:OracleLinux:7
 before 1.6.7-5.el7_9.tuxcare.els1
1.6.7-5.el7_9.tuxcare.els1
libX11-devel
TuxCare:OracleLinux:7
 before 1.6.7-5.el7_9.tuxcare.els1
1.6.7-5.el7_9.tuxcare.els1
libx11
Debian:12
 All versions, plus listed versions
2:1.8.10-12:1.8.10-22:1.8.12-12:1.8.13-12:1.8.14-1
Show 5 moreShow less
2:1.8.4-22:1.8.4-2+deb12u12:1.8.4-2+deb12u22:1.8.6-12:1.8.7-1
 None known
libx11
Debian:13
 All versions, plus listed versions
2:1.8.12-12:1.8.13-12:1.8.14-1
 None known
libx11
Debian:14
 before 2:1.8.14-1, plus listed versions
2:1.8.12-12:1.8.13-1
2:1.8.14-1
libx11
Mageia:10
From an advisory covering 4 CVEs
 before 1.8.12-1.1.mga10
1.8.12-1.1.mga10
libX11
openEuler:24.03-LTS-SP1
From an advisory covering 4 CVEs
 before 1.8.7-4.oe2403sp1
1.8.7-4.oe2403sp1
libX11
openEuler:24.03-LTS-SP3
From an advisory covering 4 CVEs
 before 1.8.7-4.oe2403sp3
1.8.7-4.oe2403sp3
libX11
openEuler:24.03-LTS-SP4
From an advisory covering 4 CVEs
 before 1.8.7-4.oe2403sp4
1.8.7-4.oe2403sp4
libX11
openEuler:22.03-LTS-SP4
From an advisory covering 4 CVEs
 before 1.7.2-11.oe2203sp4
1.7.2-11.oe2203sp4
libX11
Rocky Linux:8
 before 0:1.6.8-10.el8_10
0:1.6.8-10.el8_10
libX11
Rocky Linux:9
 before 0:1.8.12-1.el9_8.1
0:1.8.12-1.el9_8.1
libX11
Rocky Linux:10
 before 0:1.8.10-1.el10_2.1
0:1.8.10-1.el10_2.1
libx11
Root:Debian:12
 before 2:1.8.4-2+deb12u2.aikido.1
2:1.8.4-2+deb12u2.aikido.1
rootio-libx11
Root:Debian:12
 before 2:1.8.4-2+deb12u2.aikido.1
2:1.8.4-2+deb12u2.aikido.1
libx11
Root:Debian:13
 before 2:1.8.12-1.aikido.1
2:1.8.12-1.aikido.1
rootio-libx11
Root:Debian:13
 before 2:1.8.12-1.aikido.1
2:1.8.12-1.aikido.1
libX11
SUSE:Linux Micro 6.2
 before 1.8.10-160000.4.1
1.8.10-160000.4.1
libX11
SUSE:Linux Enterprise Server 16.0
 before 1.8.10-160000.4.1
1.8.10-160000.4.1
libX11
SUSE:Linux Enterprise Server for SAP applications 16.0
 before 1.8.10-160000.4.1
1.8.10-160000.4.1
libX11
SUSE:Linux Micro 6.0
From an advisory covering 4 CVEs
 before 1.8.7-159998.1.1
1.8.7-159998.1.1
libX11
SUSE:Linux Micro 6.0
 before 1.8.7-159998.2.1
1.8.7-159998.2.1
libX11
SUSE:Linux Micro 6.1
From an advisory covering 4 CVEs
 before 1.8.7-slfo.1.1_4.1
1.8.7-slfo.1.1_4.1
libX11
SUSE:Linux Enterprise Server 12 SP5-LTSS
From an advisory covering 4 CVEs
 before 1.6.2-12.41.1
1.6.2-12.41.1
libX11
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
From an advisory covering 4 CVEs
 before 1.6.2-12.41.1
1.6.2-12.41.1
libX11
SUSE:Linux Enterprise Micro 5.3
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise Micro 5.4
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise Micro 5.5
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise Server 15 SP4-LTSS
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise Server 15 SP5-LTSS
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
From an advisory covering 4 CVEs
 before 1.6.5-150000.3.41.1
1.6.5-150000.3.41.1
libX11
SUSE:Linux Enterprise Server 15 SP6-LTSS
From an advisory covering 4 CVEs
 before 1.8.7-150600.3.11.1
1.8.7-150600.3.11.1
libX11
SUSE:Linux Enterprise Server for SAP Applications 15 SP6
From an advisory covering 4 CVEs
 before 1.8.7-150600.3.11.1
1.8.7-150600.3.11.1
libX11
SUSE:Linux Enterprise Module for Basesystem 15 SP7
From an advisory covering 4 CVEs
 before 1.8.10-150700.4.8.1
1.8.10-150700.4.8.1
libx11
Ubuntu:Pro:14.04:LTS
 before 2:1.6.2-1ubuntu2.1+esm6, plus listed versions
2:1.6.1-1ubuntu12:1.6.1-1ubuntu22:1.6.2-1ubuntu12:1.6.2-1ubuntu22:1.6.2-1ubuntu2.1
Show 5 moreShow less
2:1.6.2-1ubuntu2.1+esm12:1.6.2-1ubuntu2.1+esm22:1.6.2-1ubuntu2.1+esm32:1.6.2-1ubuntu2.1+esm42:1.6.2-1ubuntu2.1+esm5
2:1.6.2-1ubuntu2.1+esm6
libx11
Ubuntu:Pro:16.04:LTS
 before 2:1.6.3-1ubuntu2.2+esm5, plus listed versions
2:1.6.3-1ubuntu22:1.6.3-1ubuntu2.12:1.6.3-1ubuntu2.22:1.6.3-1ubuntu2.2+esm12:1.6.3-1ubuntu2.2+esm22:1.6.3-1ubuntu2.2+esm32:1.6.3-1ubuntu2.2+esm4
2:1.6.3-1ubuntu2.2+esm5
libx11
Ubuntu:Pro:18.04:LTS
 before 2:1.6.4-3ubuntu0.4+esm3, plus listed versions
2:1.6.4-32:1.6.4-3ubuntu0.12:1.6.4-3ubuntu0.22:1.6.4-3ubuntu0.32:1.6.4-3ubuntu0.42:1.6.4-3ubuntu0.4+esm12:1.6.4-3ubuntu0.4+esm2
2:1.6.4-3ubuntu0.4+esm3
libx11
Ubuntu:Pro:20.04:LTS
 before 2:1.6.9-2ubuntu1.6+esm1, plus listed versions
2:1.6.8-12:1.6.9-22:1.6.9-2ubuntu12:1.6.9-2ubuntu1.12:1.6.9-2ubuntu1.22:1.6.9-2ubuntu1.52:1.6.9-2ubuntu1.6
2:1.6.9-2ubuntu1.6+esm1
libx11
Ubuntu:22.04:LTS
 before 2:1.7.5-1ubuntu0.4, plus listed versions
2:1.7.2-12:1.7.2-22:1.7.2-2build12:1.7.5-12:1.7.5-1ubuntu0.22:1.7.5-1ubuntu0.3
2:1.7.5-1ubuntu0.4
libx11
Ubuntu:24.04:LTS
 before 2:1.8.7-1ubuntu0.1, plus listed versions
2:1.8.6-1ubuntu12:1.8.7-12:1.8.7-1build1
2:1.8.7-1ubuntu0.1
libx11
Ubuntu:26.10
 All versions, plus listed versions
2:1.8.13-1
 None known
libx11
Ubuntu:26.04:LTS
 before 2:1.8.13-1ubuntu0.1, plus listed versions
2:1.8.12-1build12:1.8.12-1build22:1.8.13-1
2:1.8.13-1ubuntu0.1
libx11
Ubuntu:Pro:14.04:LTS
From an advisory covering 4 CVEs
 before 2:1.6.2-1ubuntu2.1+esm6, plus listed versions
2:1.6.1-1ubuntu12:1.6.1-1ubuntu22:1.6.2-1ubuntu12:1.6.2-1ubuntu22:1.6.2-1ubuntu2.1
Show 5 moreShow less
2:1.6.2-1ubuntu2.1+esm12:1.6.2-1ubuntu2.1+esm22:1.6.2-1ubuntu2.1+esm32:1.6.2-1ubuntu2.1+esm42:1.6.2-1ubuntu2.1+esm5
2:1.6.2-1ubuntu2.1+esm6
libx11
Ubuntu:Pro:16.04:LTS
From an advisory covering 4 CVEs
 before 2:1.6.3-1ubuntu2.2+esm5, plus listed versions
2:1.6.3-1ubuntu22:1.6.3-1ubuntu2.12:1.6.3-1ubuntu2.22:1.6.3-1ubuntu2.2+esm12:1.6.3-1ubuntu2.2+esm22:1.6.3-1ubuntu2.2+esm32:1.6.3-1ubuntu2.2+esm4
2:1.6.3-1ubuntu2.2+esm5
libx11
Ubuntu:Pro:18.04:LTS
From an advisory covering 4 CVEs
 before 2:1.6.4-3ubuntu0.4+esm3, plus listed versions
2:1.6.4-32:1.6.4-3ubuntu0.12:1.6.4-3ubuntu0.22:1.6.4-3ubuntu0.32:1.6.4-3ubuntu0.42:1.6.4-3ubuntu0.4+esm12:1.6.4-3ubuntu0.4+esm2
2:1.6.4-3ubuntu0.4+esm3
libx11
Ubuntu:Pro:20.04:LTS
From an advisory covering 4 CVEs
 before 2:1.6.9-2ubuntu1.6+esm1, plus listed versions
2:1.6.8-12:1.6.9-22:1.6.9-2ubuntu12:1.6.9-2ubuntu1.12:1.6.9-2ubuntu1.22:1.6.9-2ubuntu1.52:1.6.9-2ubuntu1.6
2:1.6.9-2ubuntu1.6+esm1
libx11
Ubuntu:22.04:LTS
From an advisory covering 4 CVEs
 before 2:1.7.5-1ubuntu0.4, plus listed versions
2:1.7.2-12:1.7.2-22:1.7.2-2build12:1.7.5-12:1.7.5-1ubuntu0.22:1.7.5-1ubuntu0.3
2:1.7.5-1ubuntu0.4
libx11
Ubuntu:24.04:LTS
From an advisory covering 4 CVEs
 before 2:1.8.7-1ubuntu0.1, plus listed versions
2:1.8.6-1ubuntu12:1.8.7-12:1.8.7-1build1
2:1.8.7-1ubuntu0.1
libx11
Ubuntu:26.04:LTS
From an advisory covering 4 CVEs
 before 2:1.8.13-1ubuntu0.1, plus listed versions
2:1.8.12-1build12:1.8.12-1build22:1.8.13-1
2:1.8.13-1ubuntu0.1
libX11
openSUSE:Tumbleweed
 before 1.8.13-2.1
1.8.13-2.1
libX11
openSUSE:Leap 16.0
 before 1.8.10-160000.4.1
1.8.10-160000.4.1

History

History
RecordedChangedSources
affected, aliases, referencesOSV
affected
affected, aliases, referencesOSV
affected, factsOSV
affectedOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-88806 is a high vulnerability (CVSS 7.5) in The X11 Project Libx11, published September 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 10th percentile. Fixed in libx11 1.8.14-r0.

References

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