The Apache XML-RPC (aka ws-xmlrpc) library 3.1.3, as used in Apache Archiva, allows remote attackers to execute arbitrary code via a crafted serialized Java object in an <ex:serializable> element.
https://exchange.xforce.ibmcloud.com/vulnerabilities/115043
http://www.securitytracker.com/id/1036294
http://www.securityfocus.com/bid/91738
https://security.gentoo.org/glsa/202401-26
https://access.redhat.com/errata/RHSA-2018:3768
https://access.redhat.com/errata/RHSA-2018:2317
https://access.redhat.com/errata/RHSA-2018:1784
https://access.redhat.com/errata/RHSA-2018:1780
https://access.redhat.com/errata/RHSA-2018:1779