Provide references for CVE-2019-1000021.
Where can I find more information about CVE-2019-1000021?
References are available at: https://lab.louiz.org/poezio/slixmpp/commit/7cd73b594e8122dddf847953fcfc85ab4d316416, https://xmpp.org/extensions/xep-0223.html#howitworks, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GKBXN7EAAR7ENEZUBKV6C6MP6QBXYTWT/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WIBP4LD2V4TBJSLZXDUAGQMD6CUI2TZR/.