---
id: CVE-2026-93519
title: X.Org Server XFixes Pointer Barrier Event List Buffer Overflow
summary: >-
  A buffer overflow when handling pointer barriers in the XFIXES extension in
  X.Org X server before 21.1.25 and XWayland before 24.1.14 could be used by
  authenticated X clients to crash or potentially execute code in X server
  context.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-122
vendor: x.org
product: xorg-x11-server
affected:
  - xorg-x11-server < 21.1.25
  - xwayland < 24.1.14
published: '2026-10-28'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T14:41:33.873Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-93519'
references:
  - url: >-
      https://gitlab.freedesktop.org/xorg/xserver/-/commit/1f42cc1f00d9c6d46978ae82dba8a52f4d902369
tags:
  - cve.org
ingestedAt: '2026-10-28T15:13:08.982Z'
---

## Overview

A buffer overflow when handling pointer barriers in the XFIXES extension in X.Org X server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.

## Affected

- `xorg-x11-server < 21.1.25`
- `xwayland < 24.1.14`

## Remediation

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