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CVE-2026-32739— libheif is Vulnerable to Infinite Loop DoS via stts Sample Duration Lookup

Quick assessment

Affected
strukturag libheif
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libheif是struktur开源的一款 ISO/IEC 23008-12:2017 HEIF 文件格式解码器和编码器。 libheif 1.21.2及之前版本存在安全漏洞，该漏洞源于Box_stts::get_sample_duration()中无限循环，消耗100% CPU，导致拒绝服务。

CVSS 6.5 · Medium EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.22.0 affected
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I. Basic Information for CVE-2026-32739

Vulnerability Information
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Vulnerability Title
libheif is Vulnerable to Infinite Loop DoS via stts Sample Duration Lookup
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
libheif 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libheif是struktur开源的一款 ISO/IEC 23008-12:2017 HEIF 文件格式解码器和编码器。 libheif 1.21.2及之前版本存在安全漏洞，该漏洞源于Box_stts::get_sample_duration()中无限循环，消耗100% CPU，导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libheif < 1.22.0 -

II. Public POCs for CVE-2026-32739

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III. Intelligence Information for CVE-2026-32739

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Vendor Advisories for CVE-2026-32739 (1)

Vendor Pages for CVE-2026-32739 (1)

Same Patch Batch · strukturag · 2026-05-19 · 6 CVEs total

CVE-2026-32740 8.8 HIGH libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing
CVE-2026-32741 7.1 HIGH libheif has a heap buffer overflow in decode_mask_image()
CVE-2026-32882 7.1 HIGH libheif: Heap Buffer OOB Read in overlay compositing due to wrong alpha stride
CVE-2026-32738 6.5 MEDIUM libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk
CVE-2026-32814 6.5 MEDIUM libheif: Uninitialized Heap Memory Information Leak via Failed Grid Tiles

IV. Related Vulnerabilities

Same product: libheif
Same vendor: strukturag
Same weakness: CWE-835

V. Comments for CVE-2026-32739

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