Heap-based buffer overflow in libheif - #VU145248
Published: August 25, 2026
Vulnerability identifier: #VU145248
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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 execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in HeifPixelImage::scale_nearest_neighbor() when parsing a crafted HEIC, HEIF, or AVIF file with nested iden and auxl item references that create duplicate Alpha planes. A remote attacker can supply a specially crafted file to execute arbitrary code.
Any application using heif_decode_image() is affected, and no special API options or unusual calling patterns are required.
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.23.2