---
id: CVE-2026-106117
title: ImageSharp is a 2D graphics library
summary: >-
  ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, decoding a strip
  TIFF using CCITT Group 3 or Modified Huffman compression can pass
  attacker-expanded runs to BitWriterUtils.WriteBits without first checking the
  current row wid…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-787
vendor: SixLabors
product: ImageSharp
affected:
  - 'ImageSharp >= 3.0.0, < 4.1.1'
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T20:03:40.690'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106117'
references:
  - url: >-
      https://github.com/SixLabors/ImageSharp/commit/e8892ecd8a95dee95c4480fda51cfe0b32f3b846
    label: security-advisories@github.com
  - url: 'https://github.com/SixLabors/ImageSharp/pull/3176'
    label: security-advisories@github.com
  - url: 'https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-jj3q-cwqj-842r
    label: security-advisories@github.com
  - url: >-
      https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-jj3q-cwqj-842r
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-06T18:19:48.989417Z'
ingestedAt: '2026-10-06T18:11:36.225Z'
---

## Overview

ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, decoding a strip TIFF using CCITT Group 3 or Modified Huffman compression can pass attacker-expanded runs to BitWriterUtils.WriteBits without first checking the current row width. T4TiffCompression.WritePixelRun can accumulate oversized makeup-code runs, and ModifiedHuffmanTiffCompression.Decompress validates the width only after writing. The unchecked writes can overflow the strip buffer, corrupt heap memory, and terminate the process. This strip-path vulnerability is distinct from the tiled decompressor-width mismatch. This issue is fixed in version 4.1.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.