Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
strukturag libheif
Exploitation
Public or AI PoC available; prioritize validation
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。

CVSS 8.8 · High EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.22.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-32740

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
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

Vendor Product Affected Versions CPE Subscribe
strukturag libheif < 1.22.0 -

II. Public POCs for CVE-2026-32740

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8356 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-32740

请登录查看更多情报信息。

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-2026-32741 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-2026-32739 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-787

V. Comments for CVE-2026-32740

No comments yet

Leave a comment