CVE-2026-32739
Medium
Description
libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and below, a crafted 800-byte HEIF sequence file causes an infinite loop in Box_stts::get_sample_duration(), consuming 100% CPU indefinitely with zero progress, leading to DoS. The loop has no iteration limit or timeout and is triggered during file open (parsing) - before any user interaction or image decoding. The process stays alive (no crash, no error logged), making it invisible to crash-based monitoring. This issue has been fixed in version 1.22.0.
SeverityMedium
CVSS6.5
Exploit probability—
ProductStruktur Libheif
PublishedMay 19, 2026
First seenMay 19, 2026
Weakness typeCWE-835CWE-835
How to fix
Update
- struktur libheif1.22.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| struktur libheif | v < 1.22.0 | 1.22.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.