CVE-2026-46521: ImageMagick out of bounds write in MIFF encoder

CVE-2026-46521 · Severity: medium · CVSS 5.5 · Published 2026-06-10

ImageMagick is a widely used open-source tool for editing and converting digital images. A flaw in how it handles specific compressed image files could allow a specially crafted image to crash the application. This could lead to a denial-of-service, interrupting automated image processing workflows or individual user tasks.

Technologies: Magick.NET-Q16-AnyCPU (NuGet), Magick.NET-Q16-arm64 (NuGet), Magick.NET-Q16-HDRI-AnyCPU (NuGet), Magick.NET-Q16-HDRI-arm64 (NuGet), Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet), Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet), Magick.NET-Q16-HDRI-x64 (NuGet), Magick.NET-Q16-HDRI-x86 (NuGet), Magick.NET-Q16-OpenMP-arm64 (NuGet), Magick.NET-Q16-OpenMP-x64 (NuGet), Magick.NET-Q16-x64 (NuGet), Magick.NET-Q16-x86 (NuGet), Magick.NET-Q8-AnyCPU (NuGet), Magick.NET-Q8-arm64 (NuGet), Magick.NET-Q8-OpenMP-arm64 (NuGet), Magick.NET-Q8-OpenMP-x64 (NuGet), Magick.NET-Q8-x64 (NuGet), Magick.NET-Q8-x86 (NuGet). Vendors: NuGet.

Quick answers

Is CVE-2026-46521 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-46521 being exploited in the wild.
How severe is CVE-2026-46521?
Medium severity, with a CVSS score of 5.5, published 10 June 2026.
Which products and versions are affected?
Magick.NET-Q16-AnyCPU (NuGet) ECOSYSTEM:introduced=0,fixed=14.13.1; Magick.NET-Q16-arm64 (NuGet) ECOSYSTEM:introduced=0,fixed=14.13.1; Magick.NET-Q16-HDRI-AnyCPU (NuGet) ECOSYSTEM:introduced=0,fixed=14.13.1; Magick.NET-Q16-HDRI-arm64 (NuGet) ECOSYSTEM:introduced=0,fixed=14.13.1; and 14 more.
Is there a fix for CVE-2026-46521?
Yes. Magick.NET-Q16-AnyCPU (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-arm64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-HDRI-AnyCPU (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-HDRI-arm64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-HDRI-x64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-HDRI-x86 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-OpenMP-arm64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-OpenMP-x64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-x64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q16-x86 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q8-AnyCPU (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q8-arm64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q8-OpenMP-arm64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q8-OpenMP-x64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q8-x64 (NuGet): upgrade to 14.13.1 or later; Magick.NET-Q8-x86 (NuGet): upgrade to 14.13.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-46521 attacked?
It is attacked with local access, in a software library.
Am I affected by CVE-2026-46521?
Check whether you run Magick.NET-Q16-AnyCPU (NuGet), Magick.NET-Q16-arm64 (NuGet), Magick.NET-Q16-HDRI-AnyCPU (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Magick.NET-Q16-AnyCPU (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-AnyCPU --version 14.13.1
  • Magick.NET-Q16-arm64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-arm64 --version 14.13.1
  • Magick.NET-Q16-HDRI-AnyCPU (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-HDRI-AnyCPU --version 14.13.1
  • Magick.NET-Q16-HDRI-arm64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-HDRI-arm64 --version 14.13.1
  • Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-HDRI-OpenMP-arm64 --version 14.13.1
  • Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-HDRI-OpenMP-x64 --version 14.13.1
  • Magick.NET-Q16-HDRI-x64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-HDRI-x64 --version 14.13.1
  • Magick.NET-Q16-HDRI-x86 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-HDRI-x86 --version 14.13.1
  • Magick.NET-Q16-OpenMP-arm64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-OpenMP-arm64 --version 14.13.1
  • Magick.NET-Q16-OpenMP-x64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-OpenMP-x64 --version 14.13.1
  • Magick.NET-Q16-x64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-x64 --version 14.13.1
  • Magick.NET-Q16-x86 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q16-x86 --version 14.13.1
  • Magick.NET-Q8-AnyCPU (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q8-AnyCPU --version 14.13.1
  • Magick.NET-Q8-arm64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q8-arm64 --version 14.13.1
  • Magick.NET-Q8-OpenMP-arm64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q8-OpenMP-arm64 --version 14.13.1
  • Magick.NET-Q8-OpenMP-x64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q8-OpenMP-x64 --version 14.13.1
  • Magick.NET-Q8-x64 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q8-x64 --version 14.13.1
  • Magick.NET-Q8-x86 (NuGet): upgrade to 14.13.1 or later
    dotnet add package Magick.NET-Q8-x86 --version 14.13.1

Technical details

An out-of-bounds write vulnerability exists in the ImageMagick MIFF encoder when processing images using LZMA compression. The root cause is a missing check during buffer size calculation (CWE-131) and an unchecked return value (CWE-252), which can lead to a heap-based buffer overwrite. An attacker can exploit this by providing a maliciously crafted image file to be processed by the library. Successful exploitation requires local access and user interaction (opening the file) and primarily results in a crash (denial of service). The vulnerability is addressed in ImageMagick versions 6.9.13-48 and 7.1.2-23.

Affected products

  • ImageMagick ImageMagick < 6.9.13-48, < 7.1.2-23

Identifiers

  • CVE-2026-46521
  • GHSA-jcqp-6r6f-3mfx

Timeline

  • 2026-05-17: advisory: GitHub Security Advisory published
  • 2026-06-10: disclosed: CVE published to NVD

References

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