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CVE-2026-32740— libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing

CVSS 8.8 · High EPSS 0.01% · P3

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
strukturaglibheif< 1.22.0affected
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I. Basic Information for CVE-2026-32740

Vulnerability Information
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Vulnerability Title
libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing
Source: NVD (National Vulnerability Database)
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled data past the end of a chroma plane heap allocation by crafting a HEIF/AVIF file with a 1×4 grid of odd-height tiles. The overflow is triggered during normal image decoding with default build configuration. The written bytes are chroma (Cb/Cr) pixel values from the attacking tile, giving the attacker full control over the overflow content. 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:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存写
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，该漏洞源于网格瓦片合成中的堆缓冲区溢出，允许攻击者通过特制HEIF/AVIF文件写入64字节可控数据到色度平面堆分配末尾。
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

VendorProductAffected VersionsCPESubscribe
strukturaglibheif < 1.22.0 -

II. Public POCs for CVE-2026-32740

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8356 chars
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III. Intelligence Information for CVE-2026-32740

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Vendor Advisories for CVE-2026-32740 (1)

Vendor Pages for CVE-2026-32740 (1)

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

CVE-2026-327417.1 HIGHlibheif has a heap buffer overflow in decode_mask_image()
CVE-2026-328827.1 HIGHlibheif: Heap Buffer OOB Read in overlay compositing due to wrong alpha stride
CVE-2026-327386.5 MEDIUMlibheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk
CVE-2026-327396.5 MEDIUMlibheif is Vulnerable to Infinite Loop DoS via stts Sample Duration Lookup
CVE-2026-328146.5 MEDIUMlibheif: Uninitialized Heap Memory Information Leak via Failed Grid Tiles

IV. Related Vulnerabilities

Same product: libheif
Same vendor: strukturag
Same weakness: CWE-787

V. Comments for CVE-2026-32740

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