Medium severity6.1NVD Advisory· Published Jul 21, 2026· Updated Jul 27, 2026
CVE-2026-47251
CVE-2026-47251
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.
Affected products
3- Range: <1.22.0
- osv-coords2 versionspkg:rpm/opensuse/libheif&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/libheif&distro=openSUSE%20Tumbleweed
< 1.23.0-160000.1.1+ 1 more
- (no CPE)range: < 1.23.0-160000.1.1
- (no CPE)range: < 1.22.2-1.1
Patches
Vulnerability mechanics
References
2- github.com/strukturag/libheif/security/advisories/GHSA-p6q9-fhf2-vj9vnvdExploitVendor Advisory
- github.com/strukturag/libheif/issues/1712nvdIssue Tracking
News mentions
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