In ImageMagick before 7.0.8-25, a memory leak exists in ReadSIXELImage in coders/sixel.c.
https://www.debian.org/security/2020/dsa-4712
https://usn.ubuntu.com/4034-1/
https://github.com/ImageMagick/ImageMagick/issues/1452
https://github.com/ImageMagick/ImageMagick/commit/748a03651e5b138bcaf160d15133de2f4b1b89ce
http://www.securityfocus.com/bid/106849
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00034.html