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

What is CVE-2025-55212?

CVE-2025-55212 is a low-severity denial of service vulnerability in Imagemagick Imagemagick, published on 26 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-369

Which versions are affected by CVE-2025-55212?

36 open source packages ship an affected version, including Magick.NET-Q16-AnyCPU, Magick.NET-Q16-HDRI-AnyCPU and Magick.NET-Q16-HDRI-OpenMP-arm64. It affects 1 product.

Products include Imagemagick Imagemagick.

How do I fix CVE-2025-55212?

Upgrade Magick.NET-Q16-AnyCPU to 14.8.1 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-55212 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55212 exists.

Other vulnerabilities in Imagemagick Imagemagick

• CVE-2019-19952 Use after free in n/a Critical 9.8
• CVE-2018-16328 Null dereference in n/a Critical 9.8
• CVE-2018-16329 Null dereference in n/a Critical 9.8
• CVE-2017-18210 Null dereference in n/a Critical 9.8
• CVE-2017-14138 Denial of service in n/a Critical 9.8

All Imagemagick Imagemagick vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLSA-2025-1759420123, CLSA-2025-1759420505, CLSA-2025-1760019285, DEBIAN-CVE-2025-55212, GHSA-fh55-q5pj-pxgw, JLSEC-2026-923 and 2 more.