What’s Vulnerable › Vulnerabilities

CVE-2026-34085

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-25 · updated 2026-06-17
• Weakness: CWE-193

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.

Affected products

• fontconfig project fontconfig: 2.17.0

References

• https://gitlab.freedesktop.org/fontconfig/fontconfig/-/commit/b9bec06d73340f1b5727302d13ac3df307b7febc
• https://gitlab.freedesktop.org/fontconfig/fontconfig/-/merge_requests/446
• https://gitlab.freedesktop.org/fontconfig/fontconfig/-/work_items/481

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