CVE-2026-106117
ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | ImageSharp | >= 3.0.0, < 3.2.0 | 3.2.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Sixlabors | Imagesharp | from 3.0.0 before 3.2.0 from 4.0.0 before 4.1.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-jj3q-cwqj-842r
- https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-jj3q-cwqj-842r
- https://nvd.nist.gov/vuln/detail/CVE-2026-106117
- https://github.com/SixLabors/ImageSharp/pull/3176
- https://github.com/SixLabors/ImageSharp/commit/e8892ecd8a95dee95c4480fda51cfe0b32f3b846
- https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.1
- https://github.com/SixLabors/ImageSharp/releases/tag/v3.2.0