libImaging/PcxDecode.c in Pillow before 6.2.2 has a PCX P mode buffer overflow.
https://www.debian.org/security/2020/dsa-4631
https://usn.ubuntu.com/4272-1/
https://pillow.readthedocs.io/en/stable/releasenotes/6.2.2.html
https://github.com/python-pillow/Pillow/commit/93b22b846e0269ee9594ff71a72bec02d2bea8fd
https://access.redhat.com/errata/RHSA-2020:0694
https://access.redhat.com/errata/RHSA-2020:0683
https://access.redhat.com/errata/RHSA-2020:0681
https://access.redhat.com/errata/RHSA-2020:0580