CVE catalog

CVE-2026-109088

libxtst: CVE-2026-109088

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published: Oct 27, 2026, 4:47:39 PM UTC
Source: [NVD] · [CVE record]

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.

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	libxtst	sid	`2:1.2.6-1`	fixed
Debian	libxtst	forky	`2:1.2.5-1`	vulnerable
Debian	libxtst	trixie	`2:1.2.5-1`	vulnerable
Debian	libxtst	bookworm	`2:1.2.3-1.1`	vulnerable
Alpine	libxtst	3.24	`1.2.6-r0`	fixed
Ubuntu	libxtst	pro	`2:1.2.3-1`	vulnerable
Ubuntu	libxtst	pro	`2:1.2.3-1ubuntu0.20.04.1~esm1`	vulnerable
Ubuntu	libxtst	22.04	`2:1.2.3-1build2`	vulnerable
Ubuntu	libxtst	22.04	`2:1.2.3-1build3`	vulnerable
Ubuntu	libxtst	22.04	`2:1.2.3-1build4`	vulnerable
Ubuntu	libxtst	22.04	`2:1.2.3-1ubuntu0.22.04.1`	vulnerable
Ubuntu	libxtst	24.04	`2:1.2.3-1.1`	vulnerable
Ubuntu	libxtst	24.04	`2:1.2.3-1.1build1`	vulnerable
Ubuntu	libxtst	24.04	`2:1.2.3-1.1ubuntu0.1`	vulnerable
Ubuntu	libxtst	26.10	`2:1.2.5-1build1`	vulnerable
Ubuntu	libxtst	26.10	`2:1.2.5-1ubuntu1`	vulnerable
Ubuntu	libxtst	26.04	`2:1.2.5-1`	vulnerable
Ubuntu	libxtst	26.04	`2:1.2.5-1build1`	vulnerable
Ubuntu	libxtst	26.04	`2:1.2.5-1ubuntu0.1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libxtst	source	sid	`2:1.2.6-1`	not yet assigned	Not reported	Not reported
Debian	libxtst	source	forky	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	libxtst	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	libxtst	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported
Alpine	libxtst	apk	3.24	`1.2.6-r0`	Not reported	ALPINE-CVE-2026-109088	Not reported

Notes

[trixie] libxtst: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libxtst6]Affected
Source package: [libxtst]
Details (2)
- 2:1.2.3-1.1 · amd64 · bookworm
  Affected
  dsa · libxtst · debian · bookworm; dsa · libxtst · debian · 12
- 2:1.2.3-1.1 · arm64 · bookworm
  Affected
  dsa · libxtst · debian · bookworm; dsa · libxtst · debian · 12
[libxtst-dev]Affected
Source package: [libxtst]
Details (2)
- 2:1.2.3-1.1 · amd64 · bookworm
  Affected
  dsa · libxtst · debian · bookworm; dsa · libxtst · debian · 12
- 2:1.2.3-1.1 · arm64 · bookworm
  Affected
  dsa · libxtst · debian · bookworm; dsa · libxtst · debian · 12
[libxtst-doc]Affected
Source package: [libxtst]
Details (2)
- 2:1.2.3-1.1 · all · bookworm
  Affected
  dsa · libxtst · debian · bookworm; dsa · libxtst · debian · 12
- 2:1.2.3-1.1 · all · bookworm
  Affected
  dsa · libxtst · debian · bookworm; dsa · libxtst · debian · 12

[Debian 13 (Trixie)]

[libxtst6]Affected
Source package: [libxtst]
Details (2)
- 2:1.2.5-1 · amd64 · trixie
  Affected
  dsa · libxtst · debian · 13
- 2:1.2.5-1 · arm64 · trixie
  Affected
  dsa · libxtst · debian · 13
[libxtst-dev]Affected
Source package: [libxtst]
Details (2)
- 2:1.2.5-1 · amd64 · trixie
  Affected
  dsa · libxtst · debian · 13
- 2:1.2.5-1 · arm64 · trixie
  Affected
  dsa · libxtst · debian · 13
[libxtst-doc]Affected
Source package: [libxtst]
Details (2)
- 2:1.2.5-1 · all · trixie
  Affected
  dsa · libxtst · debian · 13
- 2:1.2.5-1 · all · trixie
  Affected
  dsa · libxtst · debian · 13

Observed: Oct 28, 2026, 9:32:10 PM UTC

References

[Debian Security Tracker] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]