CVE-2026-34001: Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption

Overview

Severity

High (CVSS 7.8)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-29

Last Updated

2026-05-06

EPSS Score

0.01% (percentile: 0.3%)

Affected Products (3)

Open Source Software

• cbl2 xorg-x11-server 1.20.10-16 on CBL Mariner 2.0
• azl3 xorg-x11-server-Xwayland 24.1.6-3 on Azure Linux 3.0

Other

• 21316-17084

Revision History

• 2026-04-29: Information published.
• 2026-05-06: Information published.
• 2026-05-06: Information published.