CVE-2026-63335

Name of the Vulnerable Software and Affected Versions RabbitMQ Java client library versions prior to 5.31.0

Description Inbound AMQP command assembly in src/main/java/com/rabbitmq/client/impl/CommandAssembler.java processes a content-bearing method and header where the remainingBodyBytes value is smaller than a subsequent AMQP.FRAME BODY payload. The consumeBodyFrame() function subtracts the peer-controlled payload length before validation, causing remainingBodyBytes to become negative and triggering a raw UnsupportedOperationException instead of a MalformedFrameException. A malicious or compromised broker peer can send this malformed sequence on an open nonzero channel to terminate frame processing and close the client connection, resulting in a denial of service.

Recommendations Update to version 5.31.0.