ImageMagick 7.0.8-50 Q16 has memory leaks at AcquireMagickMemory because of mishandling the NoSuchImage error in CLIListOperatorImages in MagickWand/operation.c.
https://www.debian.org/security/2020/dsa-4712
https://usn.ubuntu.com/4192-1/
https://github.com/ImageMagick/ImageMagick6/commit/5982632109cad48bc6dab867298fdea4dea57c51
https://github.com/ImageMagick/ImageMagick/issues/1616
https://github.com/ImageMagick/ImageMagick/commit/5f21230b657ccd65452dd3d94c5b5401ba691a2d
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00069.html