XStream through 1.4.9, when a certain denyTypes workaround is not used, mishandles attempts to create an instance of the primitive type 'void' during unmarshalling, leading to a remote application crash, as demonstrated by an xstream.fromXML("<void/>") call.
https://www-prd-trops.events.ibm.com/node/715749
https://exchange.xforce.ibmcloud.com/vulnerabilities/125800
https://access.redhat.com/errata/RHSA-2017:2889
https://access.redhat.com/errata/RHSA-2017:2888
https://access.redhat.com/errata/RHSA-2017:1832
http://x-stream.github.io/CVE-2017-7957.html
http://www.securitytracker.com/id/1039499