In ImageMagick 7.0.8-50 Q16, ComplexImages in MagickCore/fourier.c has a heap-based buffer over-read because of incorrect calls to GetCacheViewVirtualPixels.
https://usn.ubuntu.com/4192-1/
https://lists.debian.org/debian-lts-announce/2020/09/msg00007.html
https://github.com/ImageMagick/ImageMagick6/commit/f6ffc702c6eecd963587273a429dcd608c648984
https://github.com/ImageMagick/ImageMagick/issues/1588
https://github.com/ImageMagick/ImageMagick/commit/7c2c5ba5b8e3a0b2b82f56c71dfab74ed4006df7
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00069.html