Infinite loop in libheif - #VU145243
Published: August 25, 2026
Vulnerability identifier: #VU145243
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-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a loop with an unreachable exit condition in the HEIF sequence decode timing-table initialization and sequence decode path when processing a crafted HEIF sequence file. A remote attacker can supply a crafted file with an amplified logical output sample count to cause a denial of service.
The issue can bypass the max_sequence_frames limit because the logical output sample count is not constrained after repeat amplification.
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.23.2