{"record":{"id":"a8231b7f6b4ebba6","repo":"sqlmapproject/sqlmap","slug":"invalid-backend-message-length-d","errorCode":null,"errorMessage":"invalid backend message length (%d)","messagePattern":"invalid backend message length \\((.+?)\\)","errorType":"exception","errorClass":"InterfaceError","httpStatus":null,"severity":"error","filePath":"extra/dbwire/postgres.py","lineNumber":79,"sourceCode":"\n# SQLSTATE class (first 2 chars) -> DB-API exception, so callers can distinguish (mirrors psycopg2)\n_SQLSTATE_CLASS = {\n    \"22\": DataError, \"23\": IntegrityError,\n    \"08\": OperationalError, \"28\": OperationalError, \"53\": OperationalError,\n    \"57\": OperationalError, \"58\": OperationalError,\n}\n\ndef _xor(a, b):\n    # byte-wise XOR of two equal-length byte strings (Python 2 and 3 safe)\n    if str is bytes:  # Python 2: iterating bytes yields 1-char strings\n        return b\"\".join(chr(ord(x) ^ ord(y)) for x, y in zip(a, b))\n    return bytes(x ^ y for x, y in zip(a, b))\n\ndef _read_message(sock):\n    mtype = recvn(sock, 1)\n    (length,) = struct.unpack(\"!I\", recvn(sock, 4))\n    if length < 4 or length > _MAX_MESSAGE_LENGTH:\n        raise InterfaceError(\"invalid backend message length (%d)\" % length)\n    return mtype, recvn(sock, length - 4)\n\ndef _send(sock, mtype, payload):\n    try:\n        sock.sendall((mtype or b\"\") + struct.pack(\"!I\", len(payload) + 4) + payload)\n    except (socket.error, OSError) as ex:\n        raise connection_lost(ex)\n\ndef _error_message(payload):\n    # ErrorResponse/NoticeResponse: series of (byte field-code, cstring value), terminated by a NUL byte.\n    # Returns (human message, SQLSTATE). Tolerant of a truncated/unterminated stream (find() not index()).\n    fields, off = {}, 0\n    while off < len(payload) and payload[off:off + 1] != b\"\\x00\":\n        code = payload[off:off + 1]\n        end = payload.find(b\"\\x00\", off + 1)\n        if end == -1:\n            break\n        fields[code] = payload[off + 1:end].decode(\"utf-8\", \"replace\")","sourceCodeStart":61,"sourceCodeEnd":97,"githubUrl":"https://github.com/sqlmapproject/sqlmap/blob/0a35b20e3953d341be6c7ac75ccb0b3362540c8d/extra/dbwire/postgres.py#L61-L97","documentation":"Error \"invalid backend message length (%d)\" thrown in sqlmapproject/sqlmap.","triggerScenarios":"Thrown at extra/dbwire/postgres.py:79 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"0a35b20e3953d341be6c7ac75ccb0b3362540c8d","analyzedAt":"2026-08-26T23:02:52.002Z","schemaVersion":2},"datasetVersion":"2026-08-27T03:17:27.898Z"}