CVE-2026-32739: Struktur Libheif

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Struktur Libheif: before 1.22.0 (fixed in 1.22.0)

Published 2026-05-19. Last modified 2026-07-24.