Provide references for CVE-2019-20790.
Where can I find more information about CVE-2019-20790?
References are available at: https://www.usenix.org/system/files/sec20fall_chen-jianjun_prepub_0.pdf, https://sourceforge.net/p/opendmarc/tickets/235/, https://bugs.launchpad.net/pypolicyd-spf/+bug/1838816, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2D4JGHMALEJEWWG56DKR5OZB22TK7W5B/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KBOGOQOK3TIWWJV66MW5YWNRJAFFYGR5/.