Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Struktur | Libheif | < 1.22.0 |
Related Weaknesses (CWE)
References
- https://github.com/strukturag/libheif/releases/tag/v1.22.0Release Notes
- https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8cExploitVendor Advisory
- https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8cExploitVendor Advisory
FAQ
What is CVE-2026-32739?
CVE-2026-32739 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 10...
How severe is CVE-2026-32739?
CVE-2026-32739 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-32739?
Check the references section above for vendor advisories and patch information. Affected products include: Struktur Libheif.