CVE-2026-32882— libheif: Heap Buffer OOB Read in overlay compositing due to wrong alpha stride
Possible ATT&CK Techniques 2AI
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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)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| strukturag | libheif | < 1.22.0 | - |
II. Public POCs for CVE-2026-32882
| # | POC Description | Source Link | Shenlong 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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- https://github.com/strukturag/libheif/releases/tag/v1.22.0x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-32882
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-2026-32738 | 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
- 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 - CVE-2026-32738
libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_
Same vendor: strukturag
- 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 - CVE-2026-32738
libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_
Same weakness: CWE-125
V. Comments for CVE-2026-32882
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