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.
CSIRTS triage
- What
- libheif has multiple vulnerabilities that could lead to denial of service or information disclosure.
- Who is affected
- Only Ubuntu 26.04 LTS deployments are affected.
- Urgency
- Remediation is urgent due to the potential for denial of service and information disclosure.
- Action
- Update to the latest version of libheif.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
Advisory coverage (2)
- mediumCVE-2026-47254: libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, `Track::i…nvd · 2026-07-21
- unknownUSN-8526-1: libheif vulnerabilitiesubuntu · 2026-07-09
External references
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[](https://www.csirts.com/cve/CVE-2026-47254)