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

Source: https://junglewise.ai/threats/cve-2026-46521-imagemagick-out-of-bounds-write-in-miff-encoder  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-10. Updated: 2026-06-10  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/magick-net-q16-anycpu), [Magick.NET-Q16-arm64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-arm64), [Magick.NET-Q16-HDRI-AnyCPU (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-hdri-anycpu), [Magick.NET-Q16-HDRI-arm64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-hdri-arm64), [Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-hdri-openmp-arm64), [Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-hdri-openmp-x64), [Magick.NET-Q16-HDRI-x64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-hdri-x64), [Magick.NET-Q16-HDRI-x86 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-hdri-x86), [Magick.NET-Q16-OpenMP-arm64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-openmp-arm64), [Magick.NET-Q16-OpenMP-x64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-openmp-x64), [Magick.NET-Q16-x64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-x64), [Magick.NET-Q16-x86 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q16-x86), [Magick.NET-Q8-AnyCPU (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q8-anycpu), [Magick.NET-Q8-arm64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q8-arm64), [Magick.NET-Q8-OpenMP-arm64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q8-openmp-arm64), [Magick.NET-Q8-OpenMP-x64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q8-openmp-x64), [Magick.NET-Q8-x64 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q8-x64), [Magick.NET-Q8-x86 (NuGet)](https://junglewise.ai/threats/technologies/magick-net-q8-x86). Vendors: [NuGet](https://junglewise.ai/threats/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

  ```sh
  dotnet add package Magick.NET-Q16-AnyCPU --version 14.13.1
  ```

- Magick.NET-Q16-arm64 (NuGet): upgrade to 14.13.1 or later

  ```sh
  dotnet add package Magick.NET-Q16-arm64 --version 14.13.1
  ```

- Magick.NET-Q16-HDRI-AnyCPU (NuGet): upgrade to 14.13.1 or later

  ```sh
  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

  ```sh
  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

  ```sh
  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

  ```sh
  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

  ```sh
  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

  ```sh
  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

  ```sh
  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

  ```sh
  dotnet add package Magick.NET-Q16-OpenMP-x64 --version 14.13.1
  ```

- Magick.NET-Q16-x64 (NuGet): upgrade to 14.13.1 or later

  ```sh
  dotnet add package Magick.NET-Q16-x64 --version 14.13.1
  ```

- Magick.NET-Q16-x86 (NuGet): upgrade to 14.13.1 or later

  ```sh
  dotnet add package Magick.NET-Q16-x86 --version 14.13.1
  ```

- Magick.NET-Q8-AnyCPU (NuGet): upgrade to 14.13.1 or later

  ```sh
  dotnet add package Magick.NET-Q8-AnyCPU --version 14.13.1
  ```

- Magick.NET-Q8-arm64 (NuGet): upgrade to 14.13.1 or later

  ```sh
  dotnet add package Magick.NET-Q8-arm64 --version 14.13.1
  ```

- Magick.NET-Q8-OpenMP-arm64 (NuGet): upgrade to 14.13.1 or later

  ```sh
  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

  ```sh
  dotnet add package Magick.NET-Q8-OpenMP-x64 --version 14.13.1
  ```

- Magick.NET-Q8-x64 (NuGet): upgrade to 14.13.1 or later

  ```sh
  dotnet add package Magick.NET-Q8-x64 --version 14.13.1
  ```

- Magick.NET-Q8-x86 (NuGet): upgrade to 14.13.1 or later

  ```sh
  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

- [https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-jcqp-6r6f-3mfx](https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-jcqp-6r6f-3mfx)

## Related threats

- [ImageMagick integer overflow in JNX decoder](https://junglewise.ai/threats/cve-2026-62946-imagemagick-integer-overflow-in-jnx-decoder)
- [ImageMagick heap buffer overflow in fx operation](https://junglewise.ai/threats/cve-2026-62363-imagemagick-heap-buffer-overflow-in-fx-operation)
- [ImageMagick heap buffer overwrite in morphology operation](https://junglewise.ai/threats/cve-2026-62343-imagemagick-heap-buffer-overwrite-in-morphology-operation)
- [ImageMagick memory leak in magick CLI via invalid options](https://junglewise.ai/threats/cve-2026-66011-imagemagick-memory-leak-in-magick-cli-via-invalid-options)
- [ImageMagick memory leak in TIFF encoder](https://junglewise.ai/threats/cve-2026-61872-imagemagick-memory-leak-in-tiff-encoder)