🛡️ CVE-2026-34085 — fontconfig

🟡 CVSS 5.9 — Medium ✅ No Known Exploit CWE-193 NVD
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability low.

Affected software

CVE-2026-34085 is recorded against 1 package.

  • fontconfig

Timeline and source

Published on 25 March 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

gitlab.freedesktop.org
gitlab.freedesktop.org
gitlab.freedesktop.org

CVE-2026-34085 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.9
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE CWE-193
Public Exploit ✅ No
Source NVD
Published 2026-03-25
Updated 2026-08-11
Modified 2026-06-17

Affected Packages

Software From version Fixed in
fontconfig — —

Similar Threats

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