Provide references for CVE-2019-20477.
Where can I find more information about CVE-2019-20477?
References are available at: https://github.com/yaml/pyyaml/blob/master/CHANGES, https://www.exploit-db.com/download/47655, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN/.