GHSA-JFG9-48MV-9QGX Netty MQTT: Resource exhaustion in MqttDecoder

Impact The MQTT 5 header Properties section is parsed and buffered before any message size limit is applied. Specifically, in MqttDecoder, the decodeVariableHeader method is called before the bytesRemainingBeforeVariableHeader maxBytesInMessage check. The decodeVariableHeader can call other metho...