CVE-2026-34085

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.

Score

CVSS 3.1 7.8 High

Status

Analyzed - cve@mitre.org

Published

2026-03-25

Last modified

2026-04-02

Weaknesses

CWE-193

Affected products

• Fontconfig (Fontconfig Project)

References

• https://gitlab.freedesktop.org/fontconfig/fontconfig/-/commit/b9bec06d73340f1b5727302d13ac3df307b7febc
• https://gitlab.freedesktop.org/fontconfig/fontconfig/-/merge_requests/446
• https://gitlab.freedesktop.org/fontconfig/fontconfig/-/work_items/481