Integer underflow in libheif - #VU135515
Published: June 26, 2026
Vulnerability identifier: #VU135515
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-191
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 integer underflow in the Fraction constructor when processing a crafted HEIF/AVIF file through the tiling API with process_image_transformations=1. A remote attacker can supply a specially crafted file to cause a denial of service.
User interaction is required to open the crafted file, or the issue can be triggered server-side when uploaded content is processed automatically.
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.23.1