Fix for CVE-2021-21345 in x-stream/xstream (project x-stream__xstream_CVE-2021-21345_1.4.15), commit d5e51177634afea7213b9dc2d21f101d2e258db9
Fixed file: xstream/src/java/com/thoughtworks/xstream/XStream.java
Fixed class: XStream (lines 295-2401)
Fixed method: setupSecurity (lines 640-653)
Method signature: void setupSecurity()