CVE-2026-106114: ImageSharp: ICC CLUT parsing allocates from unvalidated channel and grid dimensions

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-10-06 · updated 2026-10-24
Weakness: CWE-789

Description

ImageSharp is a 2D graphics library. From 1.0.0-beta0001 until 4.1.2, ICC CLUT parsing calculates allocation sizes from attacker-declared channel and grid dimensions before confirming that the profile contains the declared values. IccDataReader.ReadClutF32 can request a large float array, and earlier public IccProfile.Entries parsing paths can allocate a large jagged representation, from a short truncated profile. In version 4, automatic image conversion reaches the parser when DecoderOptions.ColorProfileHandling is Convert; the default Preserve mode avoids that conversion path. The demonstrated impact is memory pressure and input-validation failure, not unhandled process termination. This issue is fixed in version 4.1.2.

Affected products

SixLabors ImageSharp: from 1.0.0 before 3.2.0; from 4.0.0 before 4.1.2 — fixed in 3.2.0, 4.1.2

How to fix

Upgrade to a fixed version: SixLabors ImageSharp 3.2.0, 4.1.2. Check the vendor advisory for mitigations.

References

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