---
id: CVE-2026-106115
title: ImageSharp is a 2D graphics library
summary: >-
  ImageSharp is a 2D graphics library. From 2.1.0 until 4.1.2, the TIFF CCITT
  Group 4 encoder allocates Width times rowsPerStrip bytes even though
  T6BitCompressor.CompressStrip can emit encoded row data and two 12-bit
  end-of-facsimile-bloc…
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 >= 2.1.0, < 4.1.2'
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-2026-106115'
references:
  - url: >-
      https://github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914ac16a95
    label: security-advisories@github.com
  - url: 'https://github.com/SixLabors/ImageSharp/pull/3187'
    label: security-advisories@github.com
  - url: 'https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2'
    label: security-advisories@github.com
  - url: >-
      https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-jjfr-hcj7-qf5w
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T18:11:36.227Z'
---

## Overview

ImageSharp is a 2D graphics library. From 2.1.0 until 4.1.2, the TIFF CCITT Group 4 encoder allocates Width times rowsPerStrip bytes even though T6BitCompressor.CompressStrip can emit encoded row data and two 12-bit end-of-facsimile-block codes beyond that capacity. TiffCcittCompressor.WriteCode performs unchecked writes, and a decode-and-re-encode flow can inherit TiffCompression.CcittGroup4Fax and one-bit metadata from attacker-supplied input. The resulting out-of-bounds writes can corrupt memory and terminate the process. This issue is fixed in version 4.1.2.

## Remediation

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