diff --git a/apps/application/serializers/application_serializers.py b/apps/application/serializers/application_serializers.py
index 7ea5b011c..82a6f1ff1 100644
--- a/apps/application/serializers/application_serializers.py
+++ b/apps/application/serializers/application_serializers.py
@@ -39,7 +39,7 @@ from common.exception.app_exception import AppApiException, NotFound404, AppUnau
 from common.field.common import UploadedImageField, UploadedFileField
 from common.models.db_model_manage import DBModelManage
 from common.response import result
-from common.util.common import valid_license, password_encrypt
+from common.util.common import valid_license, password_encrypt, restricted_loads
 from common.util.field_message import ErrMessage
 from common.util.file_util import get_file_content
 from dataset.models import DataSet, Document, Image
@@ -60,6 +60,7 @@ chat_cache = cache.caches['chat_cache']
 
 
 class MKInstance:
+
     def __init__(self, application: dict, function_lib_list: List[dict], version: str):
         self.application = application
         self.function_lib_list = function_lib_list
@@ -727,7 +728,7 @@ class ApplicationSerializer(serializers.Serializer):
             user_id = self.data.get('user_id')
             mk_instance_bytes = self.data.get('file').read()
             try:
-                mk_instance = pickle.loads(mk_instance_bytes)
+                mk_instance = restricted_loads(mk_instance_bytes)
             except Exception as e:
                 raise AppApiException(1001, _("Unsupported file format"))
             application = mk_instance.application
@@ -813,7 +814,7 @@ class ApplicationSerializer(serializers.Serializer):
             return FunctionLibSerializer.Query(
                 data={'user_id': application.user_id, 'is_active': True,
                       'function_type': FunctionType.PUBLIC}
-                ).list(with_valid=True)
+            ).list(with_valid=True)
 
         def get_function_lib(self, function_lib_id, with_valid=True):
             if with_valid:
diff --git a/apps/common/util/common.py b/apps/common/util/common.py
index 2e8481c57..54baa5c45 100644
--- a/apps/common/util/common.py
+++ b/apps/common/util/common.py
@@ -10,6 +10,7 @@ import hashlib
 import importlib
 import io
 import mimetypes
+import pickle
 import re
 import shutil
 from functools import reduce
@@ -23,6 +24,30 @@ from pydub import AudioSegment
 from ..exception.app_exception import AppApiException
 from ..models.db_model_manage import DBModelManage
 
+safe_builtins = {
+    'MKInstance'
+}
+
+ALLOWED_CLASSES = {
+    ("builtins", "dict"),
+    ('uuid', 'UUID'),
+    ("application.serializers.application_serializers", "MKInstance")
+}
+
+
+class RestrictedUnpickler(pickle.Unpickler):
+
+    def find_class(self, module, name):
+        if (module, name) in ALLOWED_CLASSES:
+            return super().find_class(module, name)
+        raise pickle.UnpicklingError("global '%s.%s' is forbidden" %
+                                     (module, name))
+
+
+def restricted_loads(s):
+    """Helper function analogous to pickle.loads()."""
+    return RestrictedUnpickler(io.BytesIO(s)).load()
+
 
 def encryption(message: str):
     """