It was discovered that Gson, a Java library that can be used to convert Java Objects into their JSON representations and vice versa, was vulnerable to a de- serialization flaw. An application would de-serialize untrusted data without sufficiently verifying that the resulting data will be valid, letting the attacker to control the state or the flow of the execution. This can lead to a denial of service or even the execution of arbitrary code.
For the stable distribution (bullseye), this problem has been fixed in
We recommend that you upgrade your libgoogle-gson-java packages.