CVE-2026-32739CWE-835

libheif is Vulnerable to Infinite Loop DoS via stts Sample Duration Lookup

Medium · published May 19, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
31.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00388 · 31.7th percentile
Weakness
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Published
2026-05-19T19:10Z
EPSS history
Timeline
  • 19 MAY 19:10Z
    libheif is Vulnerable to Infinite Loop DoS via stts Sample Duration Lookup
    cvelistv5