CVE-2026-47254
Medium
Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, `Track::init_sample_timing_table()` in `libheif/sequences/track.cc` stores an out-of-bounds chunk index (`m_chunks.size()`) into `m_presentation_timeline` when the number of chunks defined in the `stco` box is less than the number of samples in `stsz`. A subsequent call to `heif_track_get_next_raw_sequence_sample()` reads `m_chunks[chunk_idx]` with that OOB index, causing a heap-buffer-overflow. Version 1.22.0 fixes the issue.
SeverityMedium
CVSS6.1
Exploit probability—
ProductStruktur Libheif
PublishedJul 21, 2026
First seenJul 21, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- struktur libheif1.22.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| struktur libheif | v < 1.22.0 | 1.22.0 |
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