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 chu

mediumCVSS 6.1CVE-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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 6.1
Published: 2026-07-21
Last updated: 2026-07-27
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-47254

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-472540.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-47254	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownUSN-8526-1: libheif vulnerabilitiesubuntu

Recent advisories for libheif is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-48029: libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.19.0 through 1.21.2 hav…nvd · 2026-07-22
mediumCVE-2026-47709: libheif is a HEIF and AVIF file format decoder and encoder. Versions prior to 1.22.0 crashes i…nvd · 2026-07-21
mediumCVE-2026-47251: libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit …nvd · 2026-07-21
highCVE-2026-47247: libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs …nvd · 2026-07-21
mediumCVE-2026-47178: libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.19.0 through 1.21.2,…nvd · 2026-07-21
mediumCVE-2026-47714: libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, the …nvd · 2026-07-21