GHSA-2C9Q-C2Q9-QGQV langgraph-api: Relative webhook targets in LangGraph Server can reach in-process routes without authentication

Summary In affected versions of langgraph-api the LangGraph Server runtime, a run or cron could be created with a relative webhook target. When the server later delivers such a webhook, it routes the request back into the same application through an in-process loopback transport that the...