sqlmapproject/sqlmap · error · InterfaceError

malformed server response: %s

Error message

malformed server response: %s

What it means

Error "malformed server response: %s" thrown in sqlmapproject/sqlmap.

Source

Thrown at extra/dbwire/tds.py:604

        pass  # sqlmap issues autonomous statements; SET IMPLICIT_TRANSACTIONS is off by default

    def rollback(self):
        pass

    def close(self):
        try:
            self._sock.close()
        except Exception:
            pass

    def _query(self, query):
        # TDS 7.2+ SQL batch must be prefixed with ALL_HEADERS carrying the transaction descriptor header
        headers = struct.pack("<I", 22) + struct.pack("<I", 18) + struct.pack("<H", 2) + struct.pack("<Q", 0) + struct.pack("<I", 1)
        _send_message(self._sock, _PKT_SQL_BATCH, headers + query.encode("utf-16-le"))
        try:
            return _parse_tokens(self._sock)
        except (struct.error, IndexError, ValueError, KeyError) as ex:
            raise InterfaceError("malformed server response: %s" % ex)

def connect(host=None, port=1433, user=None, password=None, database=None, connect_timeout=None, **kwargs):
    try:
        sock = socket.create_connection((host or "localhost", int(port or 1433)), timeout=connect_timeout)
        keepalive(sock)
    except (socket.error, socket.timeout) as ex:
        raise OperationalError("could not connect to '%s:%s' (%s)" % (host, port, ex))

    try:
        _prelogin(sock)
        _login7(sock, user, password, database)
        handshake_done(sock)
    except (DatabaseError, InterfaceError):
        try:
            sock.close()
        except Exception:
            pass
        raise

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at extra/dbwire/tds.py:604 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of sqlmapproject/sqlmap@0a35b20e39 (2026-08-26). Data as JSON: /api/errors/695ddaba188a6553. Report an issue: GitHub.