CVE-2026-34085 | THREATINT

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 Reserved 2026-03-25 | Published 2026-03-25 | Updated 2026-04-02 | Assigner mitre

MEDIUM: 5.9CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Problem types

CWE-193 Off-by-one Error

Product status

Default status

unaffected

Any version before 2.17.1

affected

References

gitlab.freedesktop.org/...6d73340f1b5727302d13ac3df307b7febc

gitlab.freedesktop.org/...ig/fontconfig/-/merge_requests/446

gitlab.freedesktop.org/...config/fontconfig/-/work_items/481

cve.org (CVE-2026-34085)

nvd.nist.gov (CVE-2026-34085)

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