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.
https://github.com/dlemstra/Magick.NET/releases/tag/14.8.1
https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-fh55-q5pj-pxgw
https://github.com/ImageMagick/ImageMagick/commit/5f0bcf986b8b5e90567750d31a37af502b73f2af