CVE-2026-32739

Name: CVE-2026-32739
Creator: NVD / NIST
Published: 2026-05-19T20:16:18.78+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.32%

Last modified Jun 17, 2026

CVE-2026-32739 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

0.32%

23.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-835

Affected Software

Vendor	Product	Versions
Struktur	Libheif	< 1.22.0

References

https://github.com/strukturag/libheif/releases/tag/v1.22.0Release Notes
https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8cExploit, Vendor Advisory
https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8cExploit, Vendor Advisory

Timeline

Published: May 19, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-32739?

How severe is CVE-2026-32739?

CVE-2026-32739 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2026-32739?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-32739?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST