CVE-2026-56003

HIGH

libXfont2 computeProps Property Buffer Heap Buffer Overflow

Title source: cna
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 8.5
EPSS 0.0037
EPSS Percentile 30.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-122
Status published
Products (2)
x/libxfont 2.0.0 - 2.0.8
X.Org/libXfont2 < 2.0.8
Published Jul 08, 2026
Tracked Since Jul 08, 2026