FasterXML jackson-databind 2.x before 2.9.10.4 mishandles the interaction between serialization gadgets and typing, related to org.apache.commons.proxy.provider.remoting.RmiProvider (aka apache/commons-proxy).
https://github.com/FasterXML/jackson-databind/issues/2666
https://lists.debian.org/debian-lts-announce/2020/04/msg00012.html
https://security.netapp.com/advisory/ntap-20200403-0002/
https://www.oracle.com/security-alerts/cpujan2021.html
https://www.oracle.com/security-alerts/cpujul2020.html