# CVE-2026-106110: ImageSharp TIFF CCITT Group 3 encoder buffer overflow

Source: https://junglewise.ai/threats/cve-2026-106110-imagesharp-is-a-2d-graphics-library-from-2-0-0-until-4-1-2-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-06. Updated: 2026-10-06  
License: CC BY 4.0 with a link back

CVE-2026-106110 · Severity: high · CVSS 7.5 · Published 2026-10-06

ImageSharp is a .NET library for image processing and manipulation used in web services and applications. The TIFF CCITT Group 3 compression encoder allocates insufficient buffer space when encoding or re-encoding narrow 1-bit images, allowing an attacker to write beyond buffer boundaries and crash the process or potentially corrupt memory. Exploitation requires the attacker to provide a specially crafted image or control the image encoding/re-encoding operation.

Technologies: [SixLabors.ImageSharp (NuGet)](https://junglewise.ai/threats/technologies/sixlabors-imagesharp), [SixLabors ImageSharp](https://junglewise.ai/threats/technologies/imagesharp). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget), [SixLabors](https://junglewise.ai/threats/vendors/sixlabors).

## Quick answers

**Is CVE-2026-106110 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-106110 being exploited in the wild.

**How severe is CVE-2026-106110?** High severity, with a CVSS score of 7.5, published 6 October 2026.

**Which products and versions are affected?** SixLabors.ImageSharp (NuGet) >= 2.0.0, <= 4.1.1, ECOSYSTEM:introduced=2.0.0,fixed=4.1.2; SixLabors ImageSharp 2.0.0 through 4.1.1.

**Is there a fix for CVE-2026-106110?** Yes. SixLabors.ImageSharp (NuGet): upgrade to 4.1.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-106110 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-106110?** Check whether you run SixLabors.ImageSharp (NuGet) or SixLabors ImageSharp at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- SixLabors.ImageSharp (NuGet): upgrade to 4.1.2 or later

  ```sh
  dotnet add package SixLabors.ImageSharp --version 4.1.2
  ```


## Technical details

A buffer overflow vulnerability exists in the TiffCcittCompressor initialization and T4BitCompressor.CompressStrip implementation when processing 1-bit TIFF images with CCITT Group 3 Fax compression. The vulnerable code fails to reserve sufficient space for row data and T4 end-of-line codes, leading to unchecked writes beyond the allocated output span. An attacker controlling the encode or decode-and-re-encode flow can trigger memory corruption or process termination.

## Affected products

- SixLabors ImageSharp 2.0.0 through 4.1.1

## Identifiers

- CVE-2026-106110
- GHSA-j9gm-c75j-xc9q

## Timeline

- 2026-10-06: disclosed

## References

- [https://github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914ac16a95](https://github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914ac16a95)
- [https://github.com/SixLabors/ImageSharp/pull/3187](https://github.com/SixLabors/ImageSharp/pull/3187)

## Related threats

- [SixLabors ImageSharp TIFF heap overflow in tiled CCITT decompression](https://junglewise.ai/threats/cve-2026-106118-imagesharp-is-a-2d-graphics-library-from-3-0-0-until-4-1-1-tiled)
- [ImageSharp buffer overflow in CCITT TIFF decompression](https://junglewise.ai/threats/cve-2026-106117-imagesharp-is-a-2d-graphics-library-from-3-0-0-until-4-1-1)
- [SixLabors ImageSharp denial of service in EXIF BigTIFF parser](https://junglewise.ai/threats/cve-2026-106116-imagesharp-is-a-2d-graphics-library-from-2-0-0-until-4-1-2)
- [ImageSharp TIFF CCITT Group 4 encoder buffer overflow](https://junglewise.ai/threats/cve-2026-106115-imagesharp-is-a-2d-graphics-library-from-2-1-0-until-4-1-2-the)
- [SixLabors ImageSharp ICC CLUT buffer over-allocation](https://junglewise.ai/threats/cve-2026-106114-imagesharp-is-a-2d-graphics-library-from-1-0-0-beta0001-until-4)