CVE-2026-34085 — MEDIUM (5.9)

Vulnerability 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.

CVSS Score

5.9

MEDIUM

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

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

LOW

Affected Products

Vendor	Product	Versions
Fontconfig Project	Fontconfig	2.17.0

Related Weaknesses (CWE)

CWE-193

References

FAQ

What is CVE-2026-34085?

CVE-2026-34085 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 FcFontC...

How severe is CVE-2026-34085?

CVE-2026-34085 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-34085?

Check the references section above for vendor advisories and patch information. Affected products include: Fontconfig Project Fontconfig.