| Name | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libheif (PTS) | bullseye | 1.11.0-1 | fixed |
| bullseye (security) | 1.11.0-1+deb11u2 | fixed |
| bookworm, bookworm (security) | 1.15.1-1+deb12u1 | fixed |
| trixie | 1.19.8-1 | fixed |
| trixie (security) | 1.19.8-1+deb13u1 | fixed |
| forky, sid | 1.23.1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libheif | source | (unstable) | (not affected) | | | |
Notes
- libheif <not-affected> (Incomplete patch for CVE-2026-3949 not applied standalone in Debian released version)
Flaw in the bounds check added by the fix for CVE-2026-3949 (b97c8b5f, v1.22.0)
The 'vvdec' backend is not built for the Debian binary packages
https://github.com/strukturag/libheif/security/advisories/GHSA-p6q9-fhf2-vj9v