Out-of-bounds read in libheif - #VU153984
Published: October 8, 2026
Vulnerability identifier: #VU153984
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
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 heap out-of-bounds read in the FFmpeg decoder plugin when processing HEVC image data without the padding required by av_parser_parse2(). A remote attacker can supply an ordinary, valid HEIC file to cause a denial of service.
Exploitation requires the FFmpeg decoder plugin to be enabled and selected. A crash is possible only when memory immediately beyond the allocation is unmapped, such as with certain guard-page allocators. When libde265 is also available, the application must explicitly select the FFmpeg decoder.
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.23.6