ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-16, a heap-based buffer overflow in the UHDR encoder can happen due to truncation of a value and it would allow an out of bounds write. This vulnerability is fixed in 7.1.2-16.
https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-h95r-c8c7-mrwx