sqlmapproject/sqlmap · error · SqlmapNoneDataException

invalid usage of inference payload without knowledge of unde

Error message

invalid usage of inference payload without knowledge of underlying DBMS

What it means

Error "invalid usage of inference payload without knowledge of underlying DBMS" thrown in sqlmapproject/sqlmap.

Source

Thrown at lib/core/agent.py:404

        if INFERENCE_MARKER in payload:
            if Backend.getIdentifiedDbms() is not None:
                inference = queries[Backend.getIdentifiedDbms()].inference

                if "dbms_version" in inference:
                    if isDBMSVersionAtLeast(inference.dbms_version):
                        inferenceQuery = inference.query
                    else:
                        inferenceQuery = inference.query2
                else:
                    inferenceQuery = inference.query

                payload = payload.replace(INFERENCE_MARKER, inferenceQuery)

            elif not kb.testMode:
                errMsg = "invalid usage of inference payload without "
                errMsg += "knowledge of underlying DBMS"
                raise SqlmapNoneDataException(errMsg)

        return payload

    def adjustLateValues(self, payload):
        """
        Returns payload with a replaced late tags (e.g. SLEEPTIME)
        """

        if payload:
            if Backend.isDbms(DBMS.SPANNER):
                payload = payload.replace(" FROM default.", " FROM ").replace(" FROM `default`.", " FROM ")

            for match in re.finditer(r"(?s)%s(.*?)%s" % (BOUNDED_BASE64_MARKER, BOUNDED_BASE64_MARKER), payload):
                _ = encodeBase64(match.group(1), binary=False, encoding=conf.encoding or UNICODE_ENCODING, safe=conf.base64Safe)
                payload = payload.replace(match.group(0), _)

            payload = payload.replace(SLEEP_TIME_MARKER, str(conf.timeSec))
            payload = payload.replace(SINGLE_QUOTE_MARKER, "'")

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at lib/core/agent.py:404 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of sqlmapproject/sqlmap@0a35b20e39 (2026-08-26). Data as JSON: /api/errors/792c6d8b929451c8. Report an issue: GitHub.