CVE-2026-32739
libheif is Vulnerable to Infinite Loop DoS via stts Sample Duration Lookup
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.
INFO
Published Date :
May 19, 2026, 8:16 p.m.
Last Modified :
May 20, 2026, 2:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update libheif to version 1.22.0 or later.
- Ensure the library is compiled with proper protections.
- Monitor processes for CPU usage spikes.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-32739.
| URL | Resource |
|---|---|
| https://github.com/strukturag/libheif/releases/tag/v1.22.0 | Release Notes |
| https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8c | Exploit Vendor Advisory |
| https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8c | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-32739 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-32739
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-32739 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-32739 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 20, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:* versions up to (excluding) 1.22.0 Added Reference Type GitHub, Inc.: https://github.com/strukturag/libheif/releases/tag/v1.22.0 Types: Release Notes Added Reference Type CISA-ADP: https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8c Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8c Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 20, 2026
Action Type Old Value New Value Added Reference https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8c -
New CVE Received by [email protected]
May. 19, 2026
Action Type Old Value New Value 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Added CWE CWE-835 Added Reference https://github.com/strukturag/libheif/releases/tag/v1.22.0 Added Reference https://github.com/strukturag/libheif/security/advisories/GHSA-j9g7-q9hv-gq8c