Pillow before 7.1.0 has multiple out-of-bounds reads in libImaging/FliDecode.c.
https://usn.ubuntu.com/4430-2/
https://usn.ubuntu.com/4430-1/
https://pillow.readthedocs.io/en/stable/releasenotes/7.1.0.html
https://lists.debian.org/debian-lts-announce/2020/08/msg00012.html
https://github.com/python-pillow/Pillow/pull/4538
https://github.com/python-pillow/Pillow/pull/4503
https://github.com/python-pillow/Pillow/commits/master/src/libImaging