Python is vulnerable to information disclosure vulnerability. This is because, the python’s functions urllib.parse.urlsplit and urllib.parse.urlparse do not properly handle URLs encoded with Punycode/Internationalizing Domain Names in Applications (IDNA), which may result in a wrong domain name (specifically the netloc component of URL - user@domain:port) being returned by those functions. An attacker could incorrectly parse a specially crafted URL to locate cookies or authentication data and send that information to a different host than when parsed correctly resulting a disclosure of information.
lists.opensuse.org/opensuse-security-announce/2019-04/msg00092.html
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lists.opensuse.org/opensuse-security-announce/2019-08/msg00042.html
lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
www.securityfocus.com/bid/107400
access.redhat.com/errata/RHBA-2019:0763
access.redhat.com/errata/RHBA-2019:0764
access.redhat.com/errata/RHBA-2019:0959
access.redhat.com/errata/RHSA-2019:0710
access.redhat.com/errata/RHSA-2019:0765
access.redhat.com/errata/RHSA-2019:0806
access.redhat.com/errata/RHSA-2019:0902
access.redhat.com/errata/RHSA-2019:0981
access.redhat.com/errata/RHSA-2019:0997
access.redhat.com/errata/RHSA-2019:1467
access.redhat.com/errata/RHSA-2019:2980
access.redhat.com/errata/RHSA-2019:3170
access.redhat.com/security/updates/classification/#important
bugs.python.org/issue36216
github.com/python/cpython/pull/12201
lists.debian.org/debian-lts-announce/2019/06/msg00022.html
lists.debian.org/debian-lts-announce/2019/06/msg00023.html
lists.debian.org/debian-lts-announce/2020/07/msg00011.html
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python-security.readthedocs.io/vuln/urlsplit-nfkc-normalization.html
security.gentoo.org/glsa/202003-26
security.netapp.com/advisory/ntap-20190517-0001/
usn.ubuntu.com/4127-1/
usn.ubuntu.com/4127-2/
www.oracle.com/security-alerts/cpujan2020.html
www.oracle.com/security-alerts/cpujul2022.html