Provide references for CVE-2021-42097.
Where can I find more information about CVE-2021-42097?
References are available at: https://mail.python.org/archives/list/mailman-announce%40python.org/thread/IKCO6JU755AP5G5TKMBJL6IEZQTTNPDQ/, https://bugs.launchpad.net/mailman/+bug/1947640, http://www.openwall.com/lists/oss-security/2021/10/21/4, https://www.debian.org/security/2021/dsa-4991.