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://exchange.xforce.ibmcloud.com/vulnerabilities/125800
https://access.redhat.com/errata/RHSA-2017:2889
https://access.redhat.com/errata/RHSA-2017:2888
https://github.com/andikahilmy/CVE-2020-26259-xstream-vulnerable
https://github.com/andikahilmy/CVE-2020-26258-xstream-vulnerable
https://github.com/andikahilmy/CVE-2020-26217-xstream-vulnerable
https://github.com/shoucheng3/x-stream__xstream_CVE-2021-21345_1-4-15
https://github.com/epicosy/XStream-1
https://github.com/advisories/GHSA-7hwc-46rm-65jh
https://www-prd-trops.events.ibm.com/node/715749
http://x-stream.github.io/CVE-2017-7957.html