CVE-2026-106111: SixLabors ImageSharp information disclosure in EXR decompression

CVE-2026-106111 · Severity: medium · CVSS 5.9 · Published 2026-10-06

ImageSharp is a .NET library for processing 2D images. When decoding OpenEXR files with ZIP or ZIPS compression, the library fails to validate that decompressed data is complete, allowing leftover bytes from prior operations to leak into decoded pixels. An attacker can craft a malicious EXR file to expose sensitive image data from other operations running in the same process.

Technologies: SixLabors.ImageSharp (NuGet), SixLabors ImageSharp. Vendors: NuGet, SixLabors.

Quick answers

Is CVE-2026-106111 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-106111 being exploited in the wild.
How severe is CVE-2026-106111?
Medium severity, with a CVSS score of 5.9, published 6 October 2026.
Which products and versions are affected?
SixLabors.ImageSharp (NuGet) >= 4.0.0, <= 4.1.1, ECOSYSTEM:introduced=4.0.0,fixed=4.1.2; SixLabors ImageSharp 4.0.0 through 4.1.1.
Is there a fix for CVE-2026-106111?
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-2026-106111 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-106111?
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

The ExrBaseDecompressor.UndoZipCompression method accepts ZIP decompression output shorter than expected without validation. When ZipExrCompression.Decompress reconstructs a partial buffer and ExrDecoderCore processes the full expected block using uninitialized or leftover memory from Configuration.Default, process-local image data becomes accessible in the decoded pixels. This affects EXR files with ZIP or ZIPS compression from versions 4.0.0 through 4.1.1; the vulnerability requires the attacker to control the EXR file being decoded.

Affected products

  • SixLabors ImageSharp 4.0.0 through 4.1.1

Identifiers

  • CVE-2026-106111
  • GHSA-4q3p-rj5x-xv7p

Timeline

  • 2026-10-06: disclosed

References

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