PT-2026-56390 · Libxfont2 · Libxfont2

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-56002

Positive Technologies (AI Summary)

CVSS v3.1

8.5

High

Base vector

AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions libXfont2 versions prior to 2.0.8

Description A heap bufferflow occurs in the pcfReadFont() function due to missing glyph bounds checking. This allows an authenticated X client to execute arbitrary code within the X server.

Recommendations Update libXfont2 to version 2.0.8 or later.

Fix

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-56002

Affected Products

Libxfont2

References · 5

• https://openwall.com/lists/oss-security/2026/07/08/1 · Vendor Advisory
• https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-56002 · Security Note
• https://twitter.com/CVEnew/status/2074825576477585871 · Twitter Post
• https://twitter.com/infoflowcloud/status/2074826201361711129 · Twitter Post