CVE-2026-47254

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.

• CWE-125

• https://github.com/strukturag/libheif/security/advisories/GHSA-wqjg-4x9g-6cvgExploit, Mitigation, Vendor Advisory

Published

Jul 21, 2026

Last Modified

Jul 27, 2026

Status

Analyzed

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