psutil (aka python-psutil) through 5.6.5 can have a double free. This occurs because of refcount mishandling within a while or for loop that converts system data into a Python object.
github.com/giampaolo/psutil/blob/master/HISTORY.rst#566
github.com/giampaolo/psutil/commit/7d512c8e4442a896d56505be3e78f1156f443465
github.com/giampaolo/psutil/pull/1616
lists.debian.org/debian-lts-announce/2019/11/msg00018.html
lists.fedoraproject.org/archives/list/[email protected]/message/2P7QI7MOTZTFXQYU23CP3RAWXCERMOAS
lists.fedoraproject.org/archives/list/[email protected]/message/OLETTJYZL2SMBUI4Q2NGBMGPDPP54SRG
nvd.nist.gov/vuln/detail/CVE-2019-18874
usn.ubuntu.com/4204-1