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CVE-2026-34085

HIGH CVSS 3.1: 7.8 EPSS 0.01%
Updated Mar 27, 2026
Fontconfig_Project
Parameter Value
CVSS 7.8 (HIGH)
Affected Versions before 2.17.1
Fixed In 2.17.1
Type CWE-193
Vendor Fontconfig_Project
Public PoC No

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.

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

CWE-193

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Fontconfig_Project Fontconfig
cpe:2.3:a:fontconfig_project:fontconfig:*:*:*:*:*:*:*:*
 — 2.17.1

References 3

https://gitlab.freedesktop.org/fontconfig/fontconfig/-/commit/b9bec06d73340f1b5…
cve@mitre.org
https://gitlab.freedesktop.org/fontconfig/fontconfig/-/merge_requests/446
cve@mitre.org
https://gitlab.freedesktop.org/fontconfig/fontconfig/-/work_items/481
cve@mitre.org
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