CVE catalog
CVE-2026-34085
fontconfig: CVE-2026-34085
- Severity
- Medium · CVSS 6.6
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.13% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | fontconfig | sid | 2.17.1-5 | not affected |
| Debian | fontconfig | forky | 2.17.1-5 | not affected |
| Debian | fontconfig | trixie | 2.15.0-2.3 | not affected |
| Debian | fontconfig | bookworm | 2.14.1-4 | not affected |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | fontconfig | source | sid | Not affected | unimportant | Not reported | Not reported |
| Debian | fontconfig | source | forky | Not affected | unimportant | Not reported | Not reported |
| Debian | fontconfig | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | fontconfig | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [fontconfig]Not affected
Details (2)
2.14.1-4· amd64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
2.14.1-4· arm64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
- [fontconfig-config]Not affected
Source package: [fontconfig]
Details (2)
2.14.1-4· amd64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
2.14.1-4· arm64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
- [libfontconfig1]Not affected
Source package: [fontconfig]
Details (2)
2.14.1-4· amd64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
2.14.1-4· arm64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
- [libfontconfig1-dev]Not affected
Source package: [fontconfig]
Details (2)
2.14.1-4· amd64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
2.14.1-4· arm64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
- [libfontconfig-dev]Not affected
Source package: [fontconfig]
Details (2)
2.14.1-4· amd64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
2.14.1-4· arm64 · bookwormNot affected
dsa · fontconfig · debian · bookworm
- [libfontconfig-doc]Not affected
Source package: [fontconfig]
Details (2)
2.14.1-4· all · bookwormNot affected
dsa · fontconfig · debian · bookworm
2.14.1-4· all · bookwormNot affected
dsa · fontconfig · debian · bookworm
Observed:
References
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-34085]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-34085]
- [https://security-tracker.debian.org/tracker/CVE-2026-34085]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34085.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1365.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]