Interpretation Conflict in libheif - #VU158757
Published: November 3, 2026
Vulnerability identifier: #VU158757
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-436
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service through excessive memory allocation.
The vulnerability exists due to an interpretation conflict between libheif's AV1 coded-size scanner and the libaom decoder when processing AVIF files containing an OBU header without a size field. A remote attacker can supply a crafted AVIF file that declares small image dimensions but contains a larger picture after the unsized OBU, bypassing the pre-decode coded-size limits and causing excessive memory allocation during decoding.
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.23.7