What’s Vulnerable › Vulnerabilities

CVE-2025-55212: ImageMagick affected by divide-by-zero in ThumbnailImage via montage -geometry ":" leads to crash

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-08-26 · updated 2026-06-17
• Weakness: CWE-369

Description

ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 6.9.13-28 and 7.1.2-2, passing a geometry string containing only a colon (":") to montage -geometry leads GetGeometry() to set width/height to 0. Later, ThumbnailImage() divides by these zero dimensions, triggering a crash (SIGFPE/abort), resulting in a denial of service. This issue has been patched in versions 6.9.13-28 and 7.1.2-2.

Affected products

• ImageMagick: before 6.9.13-28; from 7.0.0-0 before 7.1.2-2 — fixed in 6.9.13-28, 7.1.2-2

How to fix

Upgrade to a fixed version: ImageMagick 6.9.13-28, 7.1.2-2. Check the vendor advisory for mitigations.

References

• https://github.com/ImageMagick/ImageMagick/blob/0ba1b587be17543b664f7ad538e9e51e0da59d17/MagickCore/geometry.c#L355
• https://github.com/ImageMagick/ImageMagick/blob/0ba1b587be17543b664f7ad538e9e51e0da59d17/MagickCore/resize.c#L4625-L4629
• https://github.com/ImageMagick/ImageMagick/commit/5f0bcf986b8b5e90567750d31a37af502b73f2af
• https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-fh55-q5pj-pxgw
• https://github.com/dlemstra/Magick.NET/releases/tag/14.8.1
• https://lists.debian.org/debian-lts-announce/2025/09/msg00012.html
• https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-fh55-q5pj-pxgw

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