PT-2026-56391 · Libxfont2 · Libxfont2

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-56003

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 buffer overflow occurs when parsing PCF files due to missing size checking in the property buffer within the ComputeScaledProperties() function. Authenticated X clients can exploit this issue 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-2026-56003

Affected Products

Libxfont2

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-56003 · Security Note
• https://openwall.com/lists/oss-security/2026/07/08/1 · Vendor Advisory
• https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939 · Patch
• https://twitter.com/infoflowcloud/status/2074826185540870425 · Twitter Post
• https://twitter.com/CVEnew/status/2074825574925685211 · Twitter Post