VULNERABILITY INTELLIGENCE

CVE-2026-47251

CVSS score6.1 MEDIUM
EPSS probability0.16%
CISA KEVNot currently listed
Published2026-07-21
Last modified2026-10-24
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Description

libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit `b97c8b5`, PR #1712) introduced an integer overflow in the very security check it added. The check itself can be bypassed, allowing a crafted HEIF file with a VVC track to trigger the same out-of-bounds heap read that CVE-2026-3949 was meant to prevent. This is a separate, currently-unpatched vulnerability. Issue #1712 was closed as fixed without testing the edge case where `size` is near `UINT32_MAX`. Version 1.22.0 patches the issue.

Weakness classification

  • security-advisories@github.com: CWE-125

Primary references