CVE catalog

CVE-2026-88806

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 catalog]

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: Sep 21, 2026, 12:00:00 AM UTC
Updated: Sep 21, 2026, 2:17:22 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.20% · Oct 25, 2026

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

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	libx11	sid	`2:1.8.14-1`	fixed
Debian	libx11	forky	`2:1.8.13-1`	vulnerable
Debian	libx11	trixie	`2:1.8.12-1`	vulnerable
Debian	libx11	bookworm	`2:1.8.4-2+deb12u2`	vulnerable
Debian	libx11	bookworm-security	`2:1.8.4-2+deb12u2`	vulnerable
Ubuntu	libx11	noble	`2:1.8.7-1ubuntu0.1`	fixed
Ubuntu	libx11-6	noble	`2:1.8.7-1ubuntu0.1`	fixed
Ubuntu	libx11-data	noble	`2:1.8.7-1ubuntu0.1`	fixed
Ubuntu	libx11-dev	noble	`2:1.8.7-1ubuntu0.1`	fixed
Ubuntu	libx11-doc	noble	`2:1.8.7-1ubuntu0.1`	fixed
Ubuntu	libx11-xcb-dev	noble	`2:1.8.7-1ubuntu0.1`	fixed
Ubuntu	libx11-xcb1	noble	`2:1.8.7-1ubuntu0.1`	fixed
Ubuntu	libx11	pro	`2:1.6.8-1`	vulnerable
Ubuntu	libx11	pro	`2:1.6.9-2`	vulnerable
Ubuntu	libx11	pro	`2:1.6.9-2ubuntu1`	vulnerable
Ubuntu	libx11	pro	`2:1.6.9-2ubuntu1.1`	vulnerable
Ubuntu	libx11	pro	`2:1.6.9-2ubuntu1.2`	vulnerable
Ubuntu	libx11	pro	`2:1.6.9-2ubuntu1.5`	vulnerable
Ubuntu	libx11	pro	`2:1.6.9-2ubuntu1.6`	vulnerable
Ubuntu	libx11	pro	`2:1.6.9-2ubuntu1.6+esm1`	fixed
Ubuntu	libx11	22.04	`2:1.7.2-1`	vulnerable
Ubuntu	libx11	22.04	`2:1.7.2-2`	vulnerable
Ubuntu	libx11	22.04	`2:1.7.2-2build1`	vulnerable
Ubuntu	libx11	22.04	`2:1.7.5-1`	vulnerable
Ubuntu	libx11	22.04	`2:1.7.5-1ubuntu0.2`	vulnerable
Ubuntu	libx11	22.04	`2:1.7.5-1ubuntu0.3`	vulnerable
Ubuntu	libx11	22.04	`2:1.7.5-1ubuntu0.4`	fixed
Ubuntu	libx11	24.04	`2:1.8.6-1ubuntu1`	vulnerable
Ubuntu	libx11	24.04	`2:1.8.7-1`	vulnerable
Ubuntu	libx11	24.04	`2:1.8.7-1build1`	vulnerable
Ubuntu	libx11	24.04	`2:1.8.7-1ubuntu0.1`	fixed
Ubuntu	libx11	26.04	`2:1.8.12-1build1`	vulnerable
Ubuntu	libx11	26.04	`2:1.8.12-1build2`	vulnerable
Ubuntu	libx11	26.04	`2:1.8.13-1`	vulnerable
Ubuntu	libx11	26.04	`2:1.8.13-1ubuntu0.1`	fixed
Suse	libX11	linux enterprise server 15 sp6-ltss	`1.8.7-150600.3.11.1`	fixed
Suse	libX11	linux enterprise server for sap applications 15 sp6	`1.8.7-150600.3.11.1`	fixed
Suse	libX11	linux enterprise module for basesystem 15 sp7	`1.8.10-150700.4.8.1`	fixed
Suse	libX11	linux enterprise micro 5.3	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise micro 5.4	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise micro 5.5	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise high performance computing 15 sp4-espos	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise high performance computing 15 sp4-ltss	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise high performance computing 15 sp5-espos	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise high performance computing 15 sp5-ltss	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise server 15 sp4-ltss	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise server 15 sp5-ltss	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise server for sap applications 15 sp4	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise server for sap applications 15 sp5	`1.6.5-150000.3.41.1`	fixed
Suse	libX11	linux enterprise server 12 sp5-ltss	`1.6.2-12.41.1`	fixed
Suse	libX11	linux enterprise server ltss extended security 12 sp5	`1.6.2-12.41.1`	fixed
Suse	libX11	linux enterprise server 16.0	`1.8.10-160000.4.1`	fixed
Suse	libX11	linux enterprise server for sap applications 16.0	`1.8.10-160000.4.1`	fixed
Suse	libX11	linux micro 6.2	`1.8.10-160000.4.1`	fixed
Opensuse	libX11	leap 16.0	`1.8.10-160000.4.1`	fixed
Opensuse	libX11	tumbleweed	`1.8.13-2.1`	fixed
Alpine	libx11	3.24	`1.8.14-r0`	fixed
Suse	libX11	linux micro 6.0	`1.8.7-159998.1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libx11	source	sid	`2:1.8.14-1`	not yet assigned	Not reported	[1148733]
Debian	libx11	source	forky	`(unfixed)`	not yet assigned	Not reported	[1148733]
Debian	libx11	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1148733]
Debian	libx11	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1148733]
Ubuntu	libx11	deb	noble	`2:1.8.7-1ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libx11-6	deb	noble	`2:1.8.7-1ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libx11-data	deb	noble	`2:1.8.7-1ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libx11-dev	deb	noble	`2:1.8.7-1ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libx11-doc	deb	noble	`2:1.8.7-1ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libx11-xcb-dev	deb	noble	`2:1.8.7-1ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libx11-xcb1	deb	noble	`2:1.8.7-1ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libx11	deb	pro	`2:1.6.9-2ubuntu1.6+esm1`	Not reported	USN-8913-1	Not reported
Ubuntu	libx11	deb	22.04	`2:1.7.5-1ubuntu0.4`	Not reported	USN-8913-1	Not reported
Ubuntu	libx11	deb	24.04	`2:1.8.7-1ubuntu0.1`	Not reported	USN-8913-1	Not reported
Ubuntu	libx11	deb	26.04	`2:1.8.13-1ubuntu0.1`	Not reported	USN-8913-1	Not reported
Suse	libX11	rpm	linux enterprise server 15 sp6-ltss	`1.8.7-150600.3.11.1`	Not reported	SUSE-SU-2026:4501-1	Not reported
Suse	libX11	rpm	linux enterprise server for sap applications 15 sp6	`1.8.7-150600.3.11.1`	Not reported	SUSE-SU-2026:4501-1	Not reported
Suse	libX11	rpm	linux enterprise module for basesystem 15 sp7	`1.8.10-150700.4.8.1`	Not reported	SUSE-SU-2026:4502-1	Not reported
Suse	libX11	rpm	linux enterprise micro 5.3	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise micro 5.4	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise micro 5.5	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise high performance computing 15 sp4-espos	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise high performance computing 15 sp4-ltss	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise high performance computing 15 sp5-espos	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise high performance computing 15 sp5-ltss	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise server 15 sp4-ltss	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise server 15 sp5-ltss	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise server for sap applications 15 sp4	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise server for sap applications 15 sp5	`1.6.5-150000.3.41.1`	Not reported	SUSE-SU-2026:4500-1	Not reported
Suse	libX11	rpm	linux enterprise server 12 sp5-ltss	`1.6.2-12.41.1`	Not reported	SUSE-SU-2026:4410-1	Not reported
Suse	libX11	rpm	linux enterprise server ltss extended security 12 sp5	`1.6.2-12.41.1`	Not reported	SUSE-SU-2026:4410-1	Not reported
Suse	libX11	rpm	linux enterprise server 16.0	`1.8.10-160000.4.1`	Not reported	SUSE-SU-2026:23899-1	Not reported
Suse	libX11	rpm	linux enterprise server for sap applications 16.0	`1.8.10-160000.4.1`	Not reported	SUSE-SU-2026:23899-1	Not reported
Suse	libX11	rpm	linux micro 6.2	`1.8.10-160000.4.1`	Not reported	SUSE-SU-2026:23885-1	Not reported
Opensuse	libX11	rpm	leap 16.0	`1.8.10-160000.4.1`	Not reported	OPENSUSE-SU-2026:21908-1	Not reported
Opensuse	libX11	rpm	tumbleweed	`1.8.13-2.1`	Not reported	OPENSUSE-SU-2026:11833-1	Not reported
Alpine	libx11	apk	3.24	`1.8.14-r0`	Not reported	ALPINE-CVE-2026-88806	Not reported
Suse	libX11	rpm	linux micro 6.0	`1.8.7-159998.1.1`	Not reported	SUSE-SU-2026:24365-1	Not reported

[Debian bug #1148733]

Notes

[trixie] libx11: Minor issue [bookworm] libx11: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libx11-6]Affected
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
[libx11-data]Affected
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · all · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
[libx11-dev]Affected
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
[libx11-doc]Affected
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · all · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
[libx11-xcb1]Affected
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
[libx11-xcb-dev]Affected
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Affected
  nvd · libx11 · debian · bookworm; nvd · libx11 · debian · 12

[Debian 13 (Trixie)]

[libx11-6]Affected
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Affected
  nvd · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Affected
  nvd · libx11 · debian · 13
[libx11-data]Affected
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · all · trixie
  Affected
  nvd · libx11 · debian · 13
- 2:1.8.12-1 · all · trixie
  Affected
  nvd · libx11 · debian · 13
[libx11-dev]Affected
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Affected
  nvd · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Affected
  nvd · libx11 · debian · 13
[libx11-doc]Affected
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · all · trixie
  Affected
  nvd · libx11 · debian · 13
- 2:1.8.12-1 · all · trixie
  Affected
  nvd · libx11 · debian · 13
[libx11-xcb1]Affected
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Affected
  nvd · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Affected
  nvd · libx11 · debian · 13
[libx11-xcb-dev]Affected
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Affected
  nvd · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Affected
  nvd · libx11 · debian · 13

[openSUSE Tumbleweed]

[libX11-6]Unknown
Source package: [libX11]
Details (1)
- 1.8.13-1.5 · x86_64 · tumbleweed
  Unknown · Fixed: 1.8.13-2.1
  Version impact unknown
  nvd · libX11 · opensuse · tumbleweed
[libX11-6-32bit]Unknown
Source package: [libX11]
Details (1)
- 1.8.13-1.5 · x86_64 · tumbleweed
  Unknown · Fixed: 1.8.13-2.1
  Version impact unknown
  nvd · libX11 · opensuse · tumbleweed
[libX11-data]Unknown
Source package: [libX11]
Details (1)
- 1.8.13-1.5 · noarch · tumbleweed
  Unknown · Fixed: 1.8.13-2.1
  Version impact unknown
  nvd · libX11 · opensuse · tumbleweed
[libX11-devel]Unknown
Source package: [libX11]
Details (1)
- 1.8.13-1.5 · x86_64 · tumbleweed
  Unknown · Fixed: 1.8.13-2.1
  Version impact unknown
  nvd · libX11 · opensuse · tumbleweed
[libX11-devel-32bit]Unknown
Source package: [libX11]
Details (1)
- 1.8.13-1.5 · x86_64 · tumbleweed
  Unknown · Fixed: 1.8.13-2.1
  Version impact unknown
  nvd · libX11 · opensuse · tumbleweed
[libX11-devel-doc]Unknown
Source package: [libX11]
Details (1)
- 1.8.13-1.5 · noarch · tumbleweed
  Unknown · Fixed: 1.8.13-2.1
  Version impact unknown
  nvd · libX11 · opensuse · tumbleweed
[libX11-xcb1]Unknown
Source package: [libX11]
Details (1)
- 1.8.13-1.5 · x86_64 · tumbleweed
  Unknown · Fixed: 1.8.13-2.1
  Version impact unknown
  nvd · libX11 · opensuse · tumbleweed
[libX11-xcb1-32bit]Unknown
Source package: [libX11]
Details (1)
- 1.8.13-1.5 · x86_64 · tumbleweed
  Unknown · Fixed: 1.8.13-2.1
  Version impact unknown
  nvd · libX11 · opensuse · tumbleweed

Observed: Oct 27, 2026, 6:01:59 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]