| Name | CVE-2026-62291 |
| Description | libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted image sequence with a 2x2 primary plane and a 256x256 auxiliary alpha plane can cause attacker-controlled heap corruption during a normal decode and re-encode workflow. Track_Visual::decode_next_image_sample() calls transfer_channel_from_image_as() without checking that the auxiliary alpha dimensions match the main frame. The resulting inconsistent image reaches heif_track_decode_next_image() and then heif_context_encode_image(). In unc_encoder::encode(), unc_encoder_component_interleave::encode_tile() sizes its buffer with compute_tile_data_size_bytes() using the primary dimensions but copies each component using its actual plane dimensions. The oversized alpha plane is therefore copied beyond the allocation, causing an out-of-bounds write; the inverse size mismatch can also produce an out-of-bounds read. This issue is fixed in version 1.23.1. |
| 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) | 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 | 1.23.3-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libheif | source | bullseye | (not affected) | | | |
| libheif | source | bookworm | (not affected) | | | |
| libheif | source | trixie | (not affected) | | | |
| libheif | source | (unstable) | 1.23.1-1 | | | |
Notes
[trixie] - libheif <not-affected> (Vulnerable code not present, introduced in 1.20)
[bookworm] - libheif <not-affected> (Vulnerable code not present, introduced in 1.20)
[bullseye] - libheif <not-affected> (Vulnerable code not present, introduced in 1.20)
https://github.com/strukturag/libheif/security/advisories/GHSA-xpw3-9rhw-482x
Fixed by: https://github.com/strukturag/libheif/commit/ac5521ad50399885de96bb6a0733a5d2442740f9 (v1.23.1)