Heap-based buffer overflow in libheif - #VU146736
Published: September 2, 2026
Vulnerability identifier: #VU146736
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-122
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 heap-based buffer overflow in svt_encode_sequence_frame() in the SVT-AV1 encoder plugin when encoding an image with an alpha channel at a bit depth greater than 8. A remote attacker can supply a specially crafted image for transcoding to cause a denial of service.
Only builds with the SVT-AV1 encoder plugin enabled are vulnerable, and the issue is triggered on the high-bit-depth alpha-channel code path.
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.23.3