CVE-2026-55999

xorg-server / xwayland glamor font atlas Heap Buffer Overflow

State: Published
Severity: 8.5 High
Published: Jul 8, 2026
Updated: Jul 9, 2026
Reserved: Jun 18, 2026

Description

Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.

Scores

CVSS	Score	Vector	Source
3.1	8.5 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H	suse

Weaknesses

CWE-122 Heap-based buffer overflow

Affected Products

Product	Versions
xorg-serverX.Org	before 21.1.24Affected
xwaylandX.Org	before 24.1.13Affected

References

https://gitlab.freedesktop.org/xorg/xserver/-/commit/fbf7bac22e2c6bd627fb042742a23318263edae1patch
https://www.openwall.com/lists/oss-security/2026/07/08/2vendor-advisory

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