Uncontrolled recursion in Unmarshal in encoding/xml before Go 1.17.12 and Go 1.18.4 allows an attacker to cause a panic due to stack exhaustion via unmarshalling an XML document into a Go struct which has a nested field that uses the 'any' field tag.
https://go.googlesource.com/go/+/c4c1993fd2a5b26fe45c09592af6d3388a3b2e08