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CVE-2026-32738— libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk

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及之前版本存在缓冲区错误漏洞，该漏洞源于stsc box中samples_per_chunk=0导致无符号整数下溢，映射所有样本到空块，访问时触发段错误，造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.38% · P29

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.22.0 affected
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I. Basic Information for CVE-2026-32738

Vulnerability Information
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Vulnerability Title
libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk
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 792-byte HEIF sequence file with samples_per_chunk=0 in the stsc box causes an unsigned integer underflow in the Chunk constructor (m_last_sample = 0 + 0 - 1 = UINT32_MAX), mapping all samples to an empty chunk and resulting in a denial of service. When any sample is accessed, the library reads from index 0 of an empty std::vector, causing a guaranteed SEGV (null-page read). The file parses successfully without producing an error; the crash occurs on the first frame access. 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
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
libheif 缓冲区错误漏洞
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及之前版本存在缓冲区错误漏洞，该漏洞源于stsc box中samples_per_chunk=0导致无符号整数下溢，映射所有样本到空块，访问时触发段错误，造成拒绝服务。
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-2026-32738

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III. Intelligence Information for CVE-2026-32738

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Vendor Advisories for CVE-2026-32738 (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-2026-32739 6.5 MEDIUM libheif is Vulnerable to Infinite Loop DoS via stts Sample Duration Lookup
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-125

V. Comments for CVE-2026-32738

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