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.
Published: 2026-03-25
Score: 5.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Potential code execution or crash
Action: Patch Immediately
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 12 May 2026 15:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:fontconfig_project:fontconfig:2.17.0:*:*:*:*:*:*:*

Sat, 28 Mar 2026 03:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:fontconfig_project:fontconfig:*:*:*:*:*:*:*:*

Fri, 27 Mar 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 26 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
Title Off-by-One Vulnerability in Fontconfig May Enable Code Execution fontconfig: Fontconfig: Security flaw allows arbitrary code execution or system crash
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 26 Mar 2026 12:00:00 +0000

Type Values Removed Values Added
First Time appeared Fontconfig Project
Fontconfig Project fontconfig
Vendors & Products Fontconfig Project
Fontconfig Project fontconfig

Wed, 25 Mar 2026 22:00:00 +0000

Type Values Removed Values Added
Title Off-by-One Vulnerability in Fontconfig May Enable Code Execution

Wed, 25 Mar 2026 17:15:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-193
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}


Subscriptions

Fontconfig Project Fontconfig
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-04-02T17:50:01.562Z

Reserved: 2026-03-25T16:54:36.761Z

Link: CVE-2026-34085

cve-icon Vulnrichment

Updated: 2026-03-27T14:57:42.596Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-25T17:17:09.210

Modified: 2026-05-12T15:37:22.133

Link: CVE-2026-34085

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-03-25T16:54:37Z

Links: CVE-2026-34085 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-03-29T20:28:22Z

Weaknesses