🛡️ CVE-2026-47254 on Ubuntu — libheif

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-47254 as tracked by Ubuntu, for the package libheif. The fix is available in version 1.21.2-3ubuntu0.3; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability high.

Weakness class

UBUNTU-CVE-2026-47254 is classified as CWE-125: Out-of-bounds Read. The code reads past the limits of a buffer, exposing adjacent memory contents or crashing the process.

Affected software

UBUNTU-CVE-2026-47254 is recorded against 1 package.

libheif (fixed in 1.21.2-3ubuntu0.3)

Timeline and source

Published on 2 July 2026 and last revised on 29 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
ubuntu.com (Advisory)

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-07-02

Updated 2026-08-11

Modified 2026-07-29

Fix URL N/A

Affected Packages

Software	From version	Fixed in
libheif	—	1.21.2-3ubuntu0.3

References

REPORT https://ubuntu.com/security/CVE-2026-47254

REPORT https://www.cve.org/CVERecord?id=CVE-2026-47254

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

ADVISORY https://ubuntu.com/security/notices/USN-8526-1

🔗 NVD 🔗 Mitre

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