CVE•Published 2026-05-19•Modified 2026-05-20•0 articles on news•5 live references•NVD data

CVE-2026-32739Struktur · Libheif

Vulnerability data via NVD (ingested)

CVSS v3.1

6.5

MEDIUM

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

EPSS percentile

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Weaknesses (CWE)

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')

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.

Timeline

Published 2026-05-19

Modified 2026-05-20

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-32739

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Struktur Libheif"

All exposed Struktur Libheif instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Libheif"

HTTP body or banner mentions "Libheif" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-32739