Vulnerability Description
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.0, com.rabbitmq.tools.jsonrpc.ProcedureDescription receives a javaReturnType value in an untrusted system.describe response and passes it through JSONUtil.tryFill, setJavaReturnType, and computeReturnTypeAsJavaClass to Class.forName(javaReturnType) with initialization enabled. An attacker able to answer the JsonRpcClient request through a shared broker or network interception can select a class already present in the victim JVM and trigger its static initializer, while JsonRpcClient.java later passes getReturnType output to mapper.parse and may also create type confusion. Successful exploitation can affect confidentiality, integrity, and availability in the client process. This issue is fixed in version 5.33.0.
Related Weaknesses (CWE)
References
- https://github.com/rabbitmq/rabbitmq-java-client/commit/0032f75f9dc3df847f94b2b8
- https://github.com/rabbitmq/rabbitmq-java-client/commit/9f8e7efd0c648f235dc0e962
- https://github.com/rabbitmq/rabbitmq-java-client/pull/2000
- https://github.com/rabbitmq/rabbitmq-java-client/pull/2002
- https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.33.0
- https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-6g32-p
- https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-6g32-p
FAQ
What is CVE-2026-63337?
CVE-2026-63337 is a documented vulnerability. The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.0, com.rabbitmq.tools.jsonrpc.ProcedureDescription receives a java...
How severe is CVE-2026-63337?
CVSS scoring is not yet available for CVE-2026-63337. Check NVD for updates.
Is there a patch for CVE-2026-63337?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.