CVE-2026-34085

medium

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.

References

https://gitlab.freedesktop.org/fontconfig/fontconfig/-/work_items/481

https://gitlab.freedesktop.org/fontconfig/fontconfig/-/merge_requests/446

https://gitlab.freedesktop.org/fontconfig/fontconfig/-/commit/b9bec06d73340f1b5727302d13ac3df307b7febc

Details

Source: Mitre, NVD

Published: 2026-03-25

Updated: 2026-03-25

Risk Information

CVSS v2

Base Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 5.9

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L