CVE-2026-33999: Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling

Overview

Severity

Medium (CVSS 6.6)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-29

EPSS Score

0.01% (percentile: 1.4%)

Affected Products (2)

Other

• 20351-17086
• 21247-17084

Revision History

• 2026-04-29: Information published.