CVE catalog

CVE-2018-14600

libx11: CVE-2018-14600

Severity: High · CVSS 8.8CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: Aug 21, 2018, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 9.34% · Oct 25, 2026

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.

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`	fixed
Debian	libx11	trixie	`2:1.8.12-1`	fixed
Debian	libx11	bookworm	`2:1.8.4-2+deb12u2`	fixed
Debian	libx11	bookworm-security	`2:1.8.4-2+deb12u2`	fixed
Alpine	libx11	3.10	`1.6.6-r0`	fixed
Alpine	libx11	3.11	`1.6.6-r0`	fixed
Alpine	libx11	3.12	`1.6.6-r0`	fixed
Alpine	libx11	3.13	`1.6.6-r0`	fixed
Alpine	libx11	3.14	`1.6.6-r0`	fixed
Alpine	libx11	3.15	`1.6.6-r0`	fixed
Alpine	libx11	3.16	`1.6.6-r0`	fixed
Alpine	libx11	3.17	`1.6.6-r0`	fixed
Alpine	libx11	3.18	`1.6.6-r0`	fixed
Alpine	libx11	3.19	`1.6.6-r0`	fixed
Alpine	libx11	3.20	`1.6.6-r0`	fixed
Alpine	libx11	3.21	`1.6.6-r0`	fixed
Alpine	libx11	3.22	`1.6.6-r0`	fixed
Alpine	libx11	3.23	`1.6.6-r0`	fixed
Alpine	libx11	3.24	`1.6.6-r0`	fixed
Alpine	libx11	3.5	`1.6.6-r0`	fixed
Alpine	libx11	3.6	`1.6.6-r0`	fixed
Alpine	libx11	3.7	`1.6.6-r0`	fixed
Alpine	libx11	3.8	`1.6.6-r0`	fixed
Alpine	libx11	3.9	`1.6.6-r0`	fixed
Ubuntu	libx11	14.04	`2:1.6.1-1ubuntu1`	vulnerable
Ubuntu	libx11	14.04	`2:1.6.1-1ubuntu2`	vulnerable
Ubuntu	libx11	14.04	`2:1.6.2-1ubuntu1`	vulnerable
Ubuntu	libx11	14.04	`2:1.6.2-1ubuntu2`	vulnerable
Ubuntu	libx11	14.04	`2:1.6.2-1ubuntu2.1`	fixed
Ubuntu	libx11	16.04	`2:1.6.3-1ubuntu2`	vulnerable
Ubuntu	libx11	16.04	`2:1.6.3-1ubuntu2.1`	fixed
Ubuntu	libx11	18.04	`2:1.6.4-3`	vulnerable
Ubuntu	libx11	18.04	`2:1.6.4-3ubuntu0.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libx11	source	sid	`2:1.6.6-1`	low	Not reported	Not reported
Debian	libx11	source	forky	`2:1.6.6-1`	low	Not reported	Not reported
Debian	libx11	source	trixie	`2:1.6.6-1`	low	Not reported	Not reported
Debian	libx11	source	bookworm	`2:1.6.6-1`	low	Not reported	Not reported
Alpine	libx11	apk	3.10	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.11	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.12	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.13	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.14	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.15	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.16	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.17	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.18	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.19	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.20	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.21	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.22	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.23	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.24	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.5	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.6	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.7	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.8	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Alpine	libx11	apk	3.9	`1.6.6-r0`	Not reported	ALPINE-CVE-2018-14600	Not reported
Ubuntu	libx11	deb	14.04	`2:1.6.2-1ubuntu2.1`	Not reported	UBUNTU-CVE-2018-14600	Not reported
Ubuntu	libx11	deb	16.04	`2:1.6.3-1ubuntu2.1`	Not reported	UBUNTU-CVE-2018-14600	Not reported
Ubuntu	libx11	deb	18.04	`2:1.6.4-3ubuntu0.1`	Not reported	UBUNTU-CVE-2018-14600	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libx11-6]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-data]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · all · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-dev]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-doc]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · all · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · all · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-xcb1]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
[libx11-xcb-dev]Fixed
Source package: [libx11]
Details (4)
- 2:1.8.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12
- 2:1.8.4-2+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · bookworm; dsa · libx11 · debian · 12

[Debian 13 (Trixie)]

[libx11-6]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
[libx11-data]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · all · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · all · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
[libx11-dev]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
[libx11-doc]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · all · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · all · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
[libx11-xcb1]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
[libx11-xcb-dev]Fixed
Source package: [libx11]
Details (2)
- 2:1.8.12-1 · amd64 · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13
- 2:1.8.12-1 · arm64 · trixie
  Fixed · Fixed: 2:1.6.6-1
  dsa · libx11 · debian · 13

Observed: Oct 23, 2026, 5:34:39 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]