ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-16, an integer overflow vulnerability exists in the SIXEL decoer. The vulnerability allows an attacker to perform an out of bounds via a specially crafted image. This vulnerability is fixed in 7.1.2-16.
https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-r39q-jr8h-gcq2