Allocation of Resources Without Limits or Throttling in libheif - #VU147372
Published: September 8, 2026
Vulnerability identifier: #VU147372
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-770
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 improper enforcement of resource limits in the Emscripten item-ID helper functions when processing a crafted HEIF file with an excessive number of items. A remote attacker can submit a specially crafted HEIF file to cause a denial of service.
The issue affects non-standalone Emscripten builds, where an item count controls a stack allocation that can leave the WebAssembly instance unusable.
Affected software
libheif
Remediation
Install security update from vendor's website.
libheif - update to 1.23.4