JLSEC-2026-1097

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...