In ImageMagick 7.0.6-8, the load_level function in coders/xcf.c lacks offset validation, which allows attackers to cause a denial of service (load_tile memory exhaustion) via a crafted file.
https://security.gentoo.org/glsa/201711-07
https://lists.debian.org/debian-lts-announce/2020/09/msg00007.html
https://lists.debian.org/debian-lts-announce/2019/05/msg00015.html