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CVE-2026-32882— libheif: Heap Buffer OOB Read in overlay compositing due to wrong alpha stride

CVSS 7.1 · High EPSS 0.03% · P10

Affected Version Matrix 1

VendorProductVersion RangeStatus
strukturaglibheif< 1.22.0affected
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I. Basic Information for CVE-2026-32882

Vulnerability Information
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Vulnerability Title
libheif: Heap Buffer OOB Read in overlay compositing due to wrong alpha stride
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 over-read in HeifPixelImage::overlay() in libheif/pixelimage.cc. When compositing an overlay image (iovl) whose child image has a different bit depth for the alpha channel than for the color channels, the function indexes into the alpha plane using the color channel stride (in_stride) instead of the previously retrieved alpha_stride, causing reads past the end of the alpha buffer (up to 3,123 bytes for a 100×50 image with 10-bit color and 8-bit alpha). A crafted HEIF file can exploit this to cause a denial of service (crash) or potentially disclose adjacent heap memory through leaked bytes embedded in the decoded output pixels. This issue has been fixed in versionThis 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:L/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HeifPixelImage::overlay()中堆缓冲区过度读取，使用错误步长索引Alpha平面，导致读取超出缓冲区末尾。
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-2026-32882

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 7919 chars
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III. Intelligence Information for CVE-2026-32882

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Vendor Advisories for CVE-2026-32882 (1)

Vendor Pages for CVE-2026-32882 (1)

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

CVE-2026-327408.8 HIGHlibheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing
CVE-2026-327417.1 HIGHlibheif has a heap buffer overflow in decode_mask_image()
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-125

V. Comments for CVE-2026-32882

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