---
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
vendor: x.org
product: libXtst
affected:
  - libXtst < 1.2.6
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T09:17:08.463'
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
tags:
  - nvd
  - cve.org
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.