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

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), SixLabors ImageSharp. Vendors: NuGet, 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
    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

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