Is CVE-2026-34085 in the CISA KEV catalog?

No. CVE-2026-34085 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-34085?

CVE-2026-34085 has a CVSS v3 base score of 5.9 (Moderate).

What is the EPSS score for CVE-2026-34085?

CVE-2026-34085 has an EPSS score of 0.13% (3th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34085?

Upgrade fontconfig on rocky 8 to main@aarch64 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-34085

MEDIUM

5.9

CVSS v3

NVD

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.

CWE-193

How to fix

Remediation Available

fontconfigRocky

Fixed in:main@aarch64RHSA-2026:13722

Fixed in:main@srcRHSA-2026:13722

Fixed in:main@x86_64RHSA-2026:13722

Fixed in:main@noarchRHSA-2026:13722

fontconfigRed Hat / RHEL

Fixed in:main@x86_64RHSA-2026:13722

Fixed in:main@aarch64RHSA-2026:13722

Fixed in:main@srcRHSA-2026:13722

Fixed in:main@noarchRHSA-2026:13722

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.13%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Patch2

Issue Tracking1

gitlab.freedesktop.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-12.