CVE-2026-47254 | libheif is a HEIF and AVIF file format decoder and encoder. … | CVSS 6.1 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.

Metadata

CVE ID: CVE-2026-47254
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-18 22:54 UTC
Published: 2026-07-21 21:21 UTC
Last updated: 2026-07-22 18:24 UTC
Primary CWE: CWE-125
CWE-125: Out-of-bounds Read
Vendor / Product: strukturag / libheif
Sources: cve.org · NVD

Severity & Metrics

6.1 MEDIUM CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
strukturag	libheif	—	< 1.22.0

Weakness (CWE)

CWE	Source	Description
CWE-125	cna	CWE-125: Out-of-bounds Read

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.1	MEDIUM	3.1	cna	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

References (1)

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