libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, a malformed HEIF sequence file can trigger an out-of-bounds read in core sequence parsing logic, causing DoS. A malformed file can have stco.entry_count == 0 (creating no chunks) while still passing validation because saio.entry_count == 0 matches, but with saiz.sample_count > 0 the SampleAuxInfoReader constructor still enters its loop. This leads to an out-of-bounds dereference on the empty chunks[0] in chunked mode.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade libheif1Upgrade heif-viewUpgrade libheif-plugin-rav1eUpgrade libheif-plugin-j2kdecUpgrade libheif-plugin-aomdecUpgrade heif-gdk-pixbuf (Ubuntu Pro)Upgrade libheif-plugin-aomencUpgrade libheif1 (Ubuntu Pro)Upgrade libheif-devUpgrade libheif-plugin-jpegdecUpgrade libheif-plugin-libde265Upgrade libheif-dev (Ubuntu Pro)Upgrade libheif-plugin-j2kencUpgrade libheif-plugin-ffmpegdecUpgrade libheif-plugin-kvazaarUpgrade heif-thumbnailerUpgrade libheif-plugin-jpegencUpgrade libheif-plugin-svtencUpgrade libheif-plugin-x265Upgrade libheif-plugins-allUpgrade heif-gdk-pixbufUpgrade libheif-plugin-dav1dUpgrade heif-thumbnailer (Ubuntu Pro) | Jun 21, 2026 | Jun 18, 2026 |
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