CVE-2026-32738— libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
- CVE-2026-32882
libheif: Heap Buffer OOB Read in overlay compositing due to - CVE-2026-32741
libheif has a heap buffer overflow in decode_mask_image() - CVE-2026-32814
libheif: Uninitialized Heap Memory Information Leak via Fail - CVE-2026-32740
libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Comp - CVE-2026-32739
libheif is Vulnerable to Infinite Loop DoS via stts Sample D
Same vendor: strukturag
- CVE-2026-32882
libheif: Heap Buffer OOB Read in overlay compositing due to - CVE-2026-32741
libheif has a heap buffer overflow in decode_mask_image() - CVE-2026-32814
libheif: Uninitialized Heap Memory Information Leak via Fail - CVE-2026-32740
libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Comp - CVE-2026-32739
libheif is Vulnerable to Infinite Loop DoS via stts Sample D
V. Comments for CVE-2026-32738
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