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.
History

Wed, 20 May 2026 14:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*

Wed, 20 May 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 20 May 2026 10:30:00 +0000

Type Values Removed Values Added
First Time appeared Struktur
Struktur libheif
Vendors & Products Struktur
Struktur libheif

Wed, 20 May 2026 00:15:00 +0000

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References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 19 May 2026 20:00:00 +0000

Type Values Removed Values Added
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.
Title libheif is Vulnerable to Infinite Loop DoS via stts Sample Duration Lookup
Weaknesses CWE-835
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-05-19T19:10:03.585Z

Updated: 2026-05-20T13:07:09.840Z

Reserved: 2026-03-13T15:02:00.628Z

Link: CVE-2026-32739

cve-icon Vulnrichment

Updated: 2026-05-20T13:07:02.701Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-19T20:16:18.780

Modified: 2026-05-20T14:17:13.740

Link: CVE-2026-32739

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-19T19:10:03Z

Links: CVE-2026-32739 - Bugzilla