Xstream API versions up to 1.4.6 and version 1.4.10, if the security framework has not been initialized, may allow a remote attacker to run arbitrary shell commands by manipulating the processed input stream when unmarshaling XML or any supported format. e.g. JSON.
https://www.oracle.com/security-alerts/cpuoct2020.html
https://www.mail-archive.com/user%40xstream.codehaus.org/msg00607.html
https://www.mail-archive.com/user%40xstream.codehaus.org/msg00604.html
http://seclists.org/oss-sec/2014/q1/69
http://blog.diniscruz.com/2013/12/xstream-remote-code-execution-exploit.html