---
id: CVE-2026-109088
title: libXtst RECORD EnableContext Reply Endless Loop
summary: "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."
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-835
vendor: X.org
product: libXtst
affected:
  - libXtst < 1.2.6
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T16:26:20.597Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109088'
references:
  - url: 'https://gitlab.freedesktop.org/xorg/lib/libxtst/-/merge_requests/11'
tags:
  - cve.org
ingestedAt: '2026-10-27T17:33:23.803Z'
epss: 0.00272
epssPercentile: 0.1971
---

## Overview

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.

## Affected

- `libXtst < 1.2.6`

## Remediation

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