CVE-2026-106114

ImageSharp: ICC CLUT parsing allocates from unvalidated channel and grid dimensions

MEDIUM
5.3
CVSS Score
Published: October 6, 2026 at 05:48 PM UTC
Updated: October 24, 2026 at 01:29 AM UTC
1 product affected across 1 vendorImageSharp

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

1.0.0 ≤ v < 3.2.04.0.0 ≤ v < 4.1.2>= 1.0.0-beta0001, < 4.1.2

References (4)

x_refsource_CONFIRMExploitVendor Advisory
Source: cverecord
https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-gwg2-r3hj-4w44
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/SixLabors/ImageSharp/pull/3187
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-789

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