CVE-2026-56003

libXfont2 computeProps Property Buffer Heap Buffer Overflow

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

Description

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

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
libXfont2X.Org	before 2.0.8Affected

References

https://www.openwall.com/lists/oss-security/2026/07/08/1vendor-advisory
https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939patch

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