---
id: CVE-2026-94286
title: >-
  An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6
  could be used by malicious X servers to crash attached X clients.
summary: >-
  An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6
  could be used by malicious X servers to crash attached X clients.
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cwe:
  - CWE-126
  - CWE-125
vendor: x.org
product: libXtst
affected:
  - libXtst < 1.2.6
published: '2026-09-28'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T13:17:26.710'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94286'
references:
  - url: >-
      https://gitlab.freedesktop.org/xorg/lib/libxtst/-/merge_requests/10/diffs?commit_id=16023c86070e6af9407330deea3938fcef75815b
    label: meissner@suse.de
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94286.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-94286'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2542377'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-94286'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94286'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T12:58:55.309961Z'
epss: 0.00202
epssPercentile: 0.10093
ingestedAt: '2026-09-28T09:06:28.557Z'
---

## Overview

An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6 could be used by malicious X servers to crash attached X clients.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94286.json)