A flaw was found in jackson-databind before 2.9.10.7. FasterXML mishandles the interaction between serialization gadgets and typing. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
https://bugzilla.redhat.com/show_bug.cgi?id=1916633
https://github.com/FasterXML/jackson-databind/issues/2854
https://lists.debian.org/debian-lts-announce/2021/04/msg00025.html