Patch Forecast
Amber warning
Patch this week.

CVE-2026-106113 · GHSA-j3p4-wp97-rph4

ImageSharp: HistogramEqualization uses an unvalidated luminance as an unchecked histogram index

Risk score
66/100
CVSS
7.5 v3.1
Exploit chance (30 days)
0.4%
Published
6 Oct 2026

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What to know

What it is
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 val…
Affected
SixLabors.ImageSharp (nuget) >= 2.0.0, <= 4.1.1
Fix
Upgrade SixLabors.ImageSharp to 4.1.2 or later.
Exploitation
Public proof of concept

Story map

Story map: SixLabors.ImageSharpTHE FLAWSTHE FIXCVE-2026-106113ImageSharp:HistogramEqualization uses anunvalidated luminance as an…CVSS 7.5 · EPSS 0%CVE-2026-106115ImageSharp: TIFF CCITT T6encoder writes beyond anundersized output bufferCVSS 7.5 · EPSS 0%CVE-2026-106112ImageSharp: ICC LUT16 outputchannel count can write beyondVector4CVSS 7.5 · EPSS 0%CVE-2026-106110ImageSharp: TIFF CCITT T4encoder can write past itscompressed output bufferCVSS 7.5 · EPSS 0%Upgrade…4.1.2or later on your release lineWho is exposedSixLabors.ImageSharp (nuget)>= 2.0.0, <= 4.1.1AMBER · PATCH THIS WEEKSixLabors.ImageSharpImageSharp is a 2D graphicslibrary. From 2.0.0 until 4.1.2,decoding an attacker-supplied32-bit floating-point TIFF asImage<HalfVector4> andapplying HistogramEqualizationcan produce a non-finite or…Where it standsPublic proof of conceptCONNECTS TOSame weaknessOut-of-bounds write (CWE-787)259 other warnings in 30 days →Same productEarlier SixLabors.ImageSharp warnings3 in the last 90 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

SixLabors.ImageSharp: Amber, patch this week. 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 val…

The flaws

  • CVE-2026-106113: ImageSharp: HistogramEqualization uses an unvalidated luminance as an unchecked histogram index (CVSS 7.5 · EPSS 0%)
  • CVE-2026-106115: ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output buffer (CVSS 7.5 · EPSS 0%)
  • CVE-2026-106112: ImageSharp: ICC LUT16 output channel count can write beyond Vector4 (CVSS 7.5 · EPSS 0%)
  • CVE-2026-106110: ImageSharp: TIFF CCITT T4 encoder can write past its compressed output buffer (CVSS 7.5 · EPSS 0%)

The fix

Upgrade SixLabors.ImageSharp: 4.1.2 or later on your release line

Who is exposed: SixLabors.ImageSharp (nuget) >= 2.0.0, <= 4.1.1

Where it stands

  • Public proof of concept

Connects to

Why it is Amber

  • CVSS 7.5 high
  • Public exploit or proof of concept referenced
  • Remotely exploitable without logging in
  • On your watchlist: NuGet

Affected packages

PackageEcosystemVulnerableFixed in
SixLabors.ImageSharpnuget>= 2.0.0, <= 4.1.14.1.2

References

Original 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.

Last activity 6 Oct 2026. Patch Forecast updates every hour.