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.
Overview
- Severity
- Medium (CVSS 5.9)
- CVSS Vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2026-Mar
- Released
- 2026-03-27
- Last Updated
- 2026-04-22
- EPSS Score
- 0.13% (percentile: 2.5%)
Affected Products (3)
Open Source Software
- azl3 fontconfig 2.14.2-1 on Azure Linux 3.0
- azl3 fontconfig 2.14.2-2 on Azure Linux 3.0
- cbl2 fontconfig 2.13.95-1 on CBL Mariner 2.0
Revision History
- 2026-03-27: Information published.
- 2026-03-29: Information published.
- 2026-03-30: Information published.
- 2026-03-31: Information published.
- 2026-04-22: Information published.