SixLabors ImageSharp up to 4.1.0 Tiff Decompression T4TiffCompression.WritePixelRun heap-based overflow

Summaryinfo

A vulnerability labeled as problematic has been found in SixLabors ImageSharp up to 4.1.0. Affected by this issue is the function T4TiffCompression.WritePixelRun of the component Tiff Decompression. Executing a manipulation can lead to heap-based overflow. This vulnerability is tracked as CVE-2026-106117. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in SixLabors ImageSharp up to 4.1.0 and classified as problematic. This vulnerability affects the function T4TiffCompression.WritePixelRun of the component Tiff Decompression. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect availability. CVE summarizes:

ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, decoding a strip TIFF using CCITT Group 3 or Modified Huffman compression can pass attacker-expanded runs to BitWriterUtils.WriteBits without first checking the current row width. T4TiffCompression.WritePixelRun can accumulate oversized makeup-code runs, and ModifiedHuffmanTiffCompression.Decompress validates the width only after writing. The unchecked writes can overflow the strip buffer, corrupt heap memory, and terminate the process. This strip-path vulnerability is distinct from the tiled decompressor-width mismatch. This issue is fixed in version 4.1.1.

The advisory is available at github.com. This vulnerability was named CVE-2026-106117 since 10/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 4.1.1 eliminates this vulnerability.

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Productinfo

Vendor

• SixLabors

Name

• ImageSharp

Version

• 4.0
• 4.1.0

Website

• Product: https://github.com/SixLabors/ImageSharp/

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