CVE-2026-56003

libXfont2 computeProps Property Buffer Heap Buffer Overflow

Published Jul 8, 2026 CVSS 3.1 · 8.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4678-1 libxfont security update
Debian DSA Debian DSA DSA-6388-1 libxfont security update
Ubuntu USN Ubuntu USN USN-8560-1 libXfont vulnerabilities
History
Type Values Removed Values Added
First Time appeared X.org libxfont
Vendors & Products X.org libxfont
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title libXfont2 computeProps Property Buffer Heap Buffer Overflow
First Time appeared X.org
X.org libxfont2
Weaknesses CWE-122
CPEs cpe:2.3:a:x.org:libxfont2:*:*:*:*:*:*:*:*
Vendors & Products X.org
X.org libxfont2
References
Metrics cvssV3_1

{'score': 8.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
suse
Published
Updated
Jul 9, 2026, 3:55 AM
Reserved
Jun 18, 2026, 9:26 AM
Status
Analyzed
Published
Jul 8, 2026, 10:16 AM
Modified
Oct 25, 2026, 8:10 PM