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CVE-2026-56003

libXfont2 computeProps Property Buffer Heap Buffer Overflow

Published: Jul 8, 2026Updated: Jul 9, 2026 Sources: CVE List NVDCWE-122
8.5HIGH
NVD MITRE
EPSS Score
0.4%
Top 69.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-122

Affected Products

X.Org
oss-project·USaka x, x11 libraries, x11, libx11
libxfontMixed
OSS Libraries / generic-library
libXfont2On-prem
Operating Systems / unix-bsd

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939
gitlab.freedesktop.org
https://www.openwall.com/lists/oss-security/2026/07/08/1
openwall.com

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