AIKIDO-2026-302378
SixLabors.ImageSharp is vulnerable to Out-of-Bounds Write
55
Medium Risk
This Affects:
SixLabors.ImageSharpTL;DR
When ICC conversion is enabled, ImageSharp's LUT16 calculators store intermediate color values in a four-float Vector4. The ICC parser still accepts up to 15 CLUT output channels, so a malformed embedded LUT16 A2B0 profile that declares more than four output channels makes ClutCalculator.Calculate and LutEntryCalculator.CalculateLut write past that Vector4. Decoding such an image with DecoderOptions.ColorProfileHandling set to Convert corrupts memory and can terminate the process. The default Preserve handling does not run this conversion. The fix rejects ICC conversion profiles with more than four input or output channels before they reach the calculators.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you decode images that embed an ICC color profile with DecoderOptions.ColorProfileHandling set to Convert.
Background info
SixLabors.ImageSharp is vulnerable to Out-of-Bounds Write in versions 4.0.0 - 4.1.1.
How to fix this
Upgrade the SixLabors.ImageSharp library to the patch version.
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SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
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