CVE-2026-34085
March 25, 2026
fontconfig before 2.17.1 has an off-by-one error in allocation during sfnt capability handling, leading to a one-byte out-of-bounds write, and potentially a crash or code execution. This is in FcFontCapabilities in fcfreetype.c.
Affected Packages
fontconfig (CONAN):
Affected version(s) >=2.13.91 <2.17.1Fix Suggestion:
Update to version 2.17.1fontconfig (CONAN):
Affected version(s) >=2.13.91 <2.17.1Fix Suggestion:
Update to version 2.17.1fontconfig (CONAN):
Affected version(s) >=2.13.91 <2.17.1Fix Suggestion:
Update to version 2.17.1https://github.com/fontconfig/fontconfig.git (GITHUB):
Affected version(s) >=ah-20021030 <2.17.1Fix Suggestion:
Update to version 2.17.1https://github.com/fontconfig/fontconfig.git (GITHUB):
Affected version(s) >=ah-20021030 <2.17.1Fix Suggestion:
Update to version 2.17.1Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.1
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Off-by-one Error
EPSS
Base Score:
0.01
