---
id: CVE-2026-93522
title: X.Org Server Glamor CopyArea Heap Buffer Overflow
summary: >-
  A heap buffer overflow caused by mismatched size usage in CopyArea CPU-to-FBO
  path in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be
  used by authenticated X clients to crash or potentially execute code in the X
  server…
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 >= 9 < 24.1.14
published: '2026-10-28'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T16:03:56.072Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-93522'
references:
  - url: >-
      https://gitlab.freedesktop.org/xorg/xserver/-/commit/ad26c26bf795e6464f74c8ef5bb1d41403d877ab
tags:
  - cve.org
ingestedAt: '2026-10-28T17:14:44.510Z'
---

## Overview

A heap buffer overflow caused by mismatched size usage in CopyArea CPU-to-FBO path in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in the X server context.

## Affected

- `xorg-x11-server < 21.1.25`
- `xwayland >= 9 < 24.1.14`

## Remediation

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