A denial of service issue exists in the processing of the `LoginPacket` where large or complex structures within unknown `clientData` JWT properties cause excessive logging without sanitization. Attackers can send crafted `LoginPacket` messages containing deeply nested or massive object structures to trigger out-of-memory conditions, waste CPU time during serialization, or spam the console, potentially crashing the server. This occurs because the `JsonMapper` instance used to process the JWT body is configured to warn on unexpected properties instead of rejecting them, and the `warnUndefinedJsonPropertyHandler` function attempts to export the malicious object without length limitations.