strukturag libheif up to 1.21.x libheif/pixelimage.cc HeifPixelImage::overlay out-of-bounds

Summaryinfo

A vulnerability classified as critical has been found in strukturag libheif up to 1.21.x. This affects the function HeifPixelImage::overlay of the file libheif/pixelimage.cc. Performing a manipulation results in out-of-bounds. This vulnerability was named CVE-2026-32882. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in strukturag libheif up to 1.21.x. It has been classified as critical. This affects the function HeifPixelImage::overlay of the file libheif/pixelimage.cc. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-32882 since 03/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 316409 (Linux Distros Unpatched Vulnerability : CVE-2026-32882), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.22.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (316409). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• strukturag

Name

• libheif

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21

Website

• Product: https://github.com/strukturag/libheif/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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