this is a quick fix and does not

account for duplicates in other
string fields, like Mitre tags,
references, etc. But this is still
a good and helpful check

Author: pyth0n1c

contentctl/objects/abstract_security_content_objects/security_content_object_abstract.py

@@ -12,6 +12,7 @@
 import pprint
 import uuid
 from abc import abstractmethod
+from collections import Counter
 from difflib import get_close_matches
 from functools import cached_property
 from typing import List, Optional, Tuple, Union
@@ -708,6 +709,15 @@ def mapNamesToSecurityContentObjects(
                 "an error in the contentctl codebase which must be resolved."
             )
 
+        # Catch all for finding duplicates in mapped content
+        if (
+            len(duplicates := [name for name, count in Counter(v).items() if count > 1])
+            > 0
+        ):
+            raise ValueError(
+                f"Duplicate {cls.__name__} ({duplicates}) found in list: {v}."
+            )
+
         mappedObjects: list[Self] = []
         mistyped_objects: list[SecurityContentObject_Abstract] = []
         missing_objects: list[str] = []