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CVE-2026-32741— libheif has a heap buffer overflow in decode_mask_image()

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及之前版本存在安全漏洞，该漏洞源于MaskImageCodec::decode_mask_image()中堆缓冲区溢出，未对数据长度进行上限检查，导致memcpy复制超出目标缓冲区大小。

CVSS 7.1 · High EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.22.0 affected
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I. Basic Information for CVE-2026-32741

Vulnerability Information
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Vulnerability Title
libheif has a heap buffer overflow in decode_mask_image()
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and below contain a heap buffer overflow in MaskImageCodec::decode_mask_image(). When decoding a HEIF file containing a mask image (mski), the function copies the full iloc extent data into a pixel buffer using memcpy(dst, data.data(), data.size()). The copy length data.size() is determined by the iloc extent in the file (attacker-controlled), while the destination buffer is sized based on the declared image dimensions. Because no upper-bound check exists on the data length, a crafted file whose iloc extent exceeds the pixel buffer allocation overflows the heap. The vulnerable single-memcpy branch is reached when the mskC property specifies bits_per_pixel = 8 and the ispe property declares an even width ≥ 64 (so that stride == width), with no changes to default security limits or external codec plugins required. 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:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
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MaskImageCodec::decode_mask_image()中堆缓冲区溢出，未对数据长度进行上限检查，导致memcpy复制超出目标缓冲区大小。
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-2026-32741

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 14865 chars
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III. Intelligence Information for CVE-2026-32741

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Vendor Advisories for CVE-2026-32741 (1)

Vendor Pages for CVE-2026-32741 (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-2026-32882 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-122

V. Comments for CVE-2026-32741

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