CVE-2026-56003
libXfont2 computeProps Property Buffer Heap Buffer Overflow
CVSS Score
8.5
EPSS Score
0.6%
EPSS Percentile
44th
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.
| CWE | CWE-122 |
| Vendor | x.org |
| Product | libxfont2 |
| Published | Jul 8, 2026 |
| Last Updated | Jul 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
X.Org / libXfont2
0 < 2.0.8
References
Credits
Anonymous working with Trend Micro Zero Day Initiative