Vulnerability · Published Jul 21, 2026 · Assigned by GitHub_M

CVE-2026-47254libheif Has Heap Buffer Overflow in `Track::get_next_sample_raw_data()` -- OOB Chunk Vector Access

Medium 6.1

In plain English

A medium-severity out-of-bounds read in libheif from strukturag. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.2%top 94.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	libheif	no fix listed	DEBIAN-CVE-2026-47254
Debian:14	libheif	1.23.1-1	DEBIAN-CVE-2026-47254
Ubuntu:26.04:LTS	libheif	1.21.2-3ubuntu0.3	UBUNTU-CVE-2026-47254

Affected products (as reported)

Vendor	Product	Versions
strukturag	libheif	< 1.22.0

Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

References

https://github.com/strukturag/libheif/security/advisories/GHSA-wqjg-4x9g-6cvg x_refsource_CONFIRM