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.
CVSS Details
- CVSS 3.1 Base Score: 5.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade libheif-plugin-jpegencUpgrade heif-thumbnailerUpgrade libheif1Upgrade libheif-plugin-x265Upgrade libheif-plugin-ffmpegdecUpgrade libheif-plugin-kvazaarUpgrade libheif-plugins-allUpgrade heif-viewUpgrade libheif-plugin-svtencUpgrade libheif-plugin-libde265Upgrade heif-gdk-pixbufUpgrade libheif-devUpgrade libheif-plugin-dav1dUpgrade libheif-plugin-rav1eUpgrade libheif-plugin-j2kdecUpgrade libheif-plugin-jpegdecUpgrade libheif-plugin-aomencUpgrade libheif-plugin-j2kencUpgrade libheif-plugin-aomdec | Aug 27, 2026 | Aug 26, 2026 |
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