MEDIUM 5.9 Microsoft

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.

Microsoft Security Update 2026-Mar: 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

References

Published: 2026-03-10 · Source: Microsoft · Feed updated: 2026-08-10
This medium severity vulnerability with a CVSS score of 5.9 was published on 2026-03-10 via Microsoft. Affected: 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.
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