Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

CVE-2026-106113ImageSharp: HistogramEqualization uses an unvalidated luminance as an unchecked histogram index

High 7.5

In plain English

A high-severity out-of-bounds write in ImageSharp from SixLabors. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 66.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

ImageSharp is a 2D graphics library. From 2.0.0 until 4.1.2, decoding an attacker-supplied 32-bit floating-point TIFF as Image<HalfVector4> and applying HistogramEqualization can produce a non-finite or out-of-range luminance in ColorNumerics.GetBT709Luminance. GrayscaleLevelsRowOperation.Invoke uses the resulting value as an unchecked histogram offset, causing an unsafe out-of-range access and process termination. Adaptive Histogram Equalization and AutoLevel are not affected by this report. This issue is fixed in version 4.1.2.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
NuGet	sixlabors.imagesharp	3.2.0	GHSA-j3p4-wp97-rph4
NuGet	sixlabors.imagesharp	4.1.2	GHSA-j3p4-wp97-rph4

Affected products (as reported)

Vendor	Product	Versions
SixLabors	ImageSharp	>= 2.0.0, < 4.1.2

Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-j3p4-wp97-rph4 x_refsource_CONFIRM
https://github.com/SixLabors/ImageSharp/pull/3187 x_refsource_MISC
https://github.com/SixLabors/ImageSharp/commit/c4c4bf292298c026df470db1a17ff826515fd95d x_refsource_MISC
https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2 x_refsource_MISC