sqlmapproject/sqlmap · error · SqlmapDataException

Esperanto could not establish a reliable extraction oracle o

Error message

Esperanto could not establish a reliable extraction oracle on this target (%s)

What it means

Error "Esperanto could not establish a reliable extraction oracle on this target (%s)" thrown in sqlmapproject/sqlmap.

Source

Thrown at extra/esperanto/handler.py:81

                # boolean-blind technique: no marker, no concatenation, whole-page true/false,
                # works everywhere. only fall back to whatever-technique-is-available if the
                # target has no usable boolean-blind vector. _ask decides what an undecidable
                # probe MEANS by context (skip a candidate rung vs degrade a data read loudly).
                esp = Esperanto(_blindOracle, retries=2)
                logger.info("Esperanto is discovering the back-end SQL dialect (agnostic mode, boolean-blind)")
                try:
                    esp.discover()
                except RuntimeError:
                    # no usable boolean-blind vector on this target - retry with any technique
                    # sqlmap detected (UNION/error/time); may hit the CONCAT limitation above
                    esp = Esperanto(lambda condition: checkBooleanExpression(condition), retries=2)
                    logger.info("Esperanto retrying discovery via any available inference technique")
                    try:
                        esp.discover()
                    except RuntimeError as ex:
                        # genuinely unusable (unstable target, or no substring/pattern
                        # primitive) - stop cleanly instead of surfacing an internal traceback
                        raise SqlmapDataException("Esperanto could not establish a reliable extraction oracle on this target (%s)" % ex)
                logger.info("Esperanto dialect verdict: %s" % (esp.identify().get("product") or "unknown"))
                esp._progress = lambda value: logger.info("retrieved: %s" % _sanitize(value))  # live feedback (sanitized)
                self._esp = esp
                self._notesLogged = 0
                self._flushNotes()                      # discovery-time notes
            return self._esp

        def _flushNotes(self):
            # surface degradation notes LOUDLY as they accrue. Enumeration/dump append notes
            # AFTER discovery, so logging once would hide every runtime degradation (incomplete
            # listing, truncation, blocked paging) - flush the NEW ones after each operation.
            notes = self._esp.dialect.notes if self._esp else []
            for note in notes[self._notesLogged:]:
                logger.warning("Esperanto: %s" % note)
            self._notesLogged = len(notes)

        def _scopeDb(self):
            # the database to scope table/column lookups to: -D if given, else the

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at extra/esperanto/handler.py:81 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/7b4bfb3e3db6832e. Report an issue: GitHub.