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CVE-2026-25637: ImageMagick: Possible memory leak in ASHLAR encoder

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-24 · updated 2026-06-17
• Weakness: CWE-401

Description

ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to version 7.1.2-15, a memory leak in the ASHLAR image writer allows an attacker to exhaust process memory by providing a crafted image that results in small objects that are allocated but never freed. Version 7.1.2-15 contains a patch.

Affected products

• Dlemstra Magick.Net: before 14.10.3 — fixed in 14.10.3
• ImageMagick: before 7.1.2-15 — fixed in 7.1.2-15

How to fix

Upgrade to a fixed version: Dlemstra Magick.Net 14.10.3; ImageMagick 7.1.2-15. Check the vendor advisory for mitigations.

References

• https://github.com/ImageMagick/ImageMagick/commit/30ce0e8efbd72fd6b50ed3a10ae22f57c8901137
• https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-gm37-qx7w-p258
• https://github.com/dlemstra/Magick.NET/releases/tag/14.10.3

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