In libImaging/Jpeg2KDecode.c in Pillow before 7.1.0, there are multiple out-of-bounds reads via a crafted JP2 file.
github.com/python-pillow/Pillow/commits/master/src/libImaging/
github.com/python-pillow/Pillow/pull/4505
github.com/python-pillow/Pillow/pull/4538
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BEBCPE4F2VHTIT6EZA2YZQZLPVDEBJGD/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HOKHNWV2VS5GESY7IBD237E7C6T3I427/
pillow.readthedocs.io/en/stable/releasenotes/
pillow.readthedocs.io/en/stable/releasenotes/7.1.0.html
usn.ubuntu.com/4430-1/
usn.ubuntu.com/4430-2/