| Name | CVE-2026-34085 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| fontconfig (PTS) | bullseye | 2.13.1-4.2 | fixed |
| bookworm | 2.14.1-4 | fixed | |
| trixie | 2.15.0-2.3 | fixed | |
| forky, sid | 2.17.1-5 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| fontconfig | source | (unstable) | (not affected) |
- fontconfig <not-affected> (Vulnerable code in no Debian released version via unstable)
https://gitlab.freedesktop.org/fontconfig/fontconfig/-/work_items/481
Fixed by: https://gitlab.freedesktop.org/fontconfig/fontconfig/-/commit/b9bec06d73340f1b5727302d13ac3df307b7febc (2.17.1)
Introduced by: https://gitlab.freedesktop.org/fontconfig/fontconfig/-/commit/bf3fbad0ffa955a63bc7b515da002d363cf4d5fc (2.17.0)