# UNDF: UNDF-2026-000000658
--- a/salt/cloud/__init__.py
+++ b/salt/cloud/__init__.py
@@ -1830,18 +1830,18 @@ class Map(Cloud):
     def _has_loop(self, dmap, seen=None, val=None):
         if seen is None:
             for values in dmap["create"].values():
-                seen = []
+                seen = set()
                 try:
                     machines = values["requires"]
                 except KeyError:
                     machines = []
                 for machine in machines:
-                    if self._has_loop(dmap, seen=list(seen), val=machine):
+                    if self._has_loop(dmap, seen=set(seen), val=machine):
                         return True
         else:
             if val in seen:
                 return True

-            seen.append(val)
+            seen.add(val)
             try:
                 machines = dmap["create"][val]["requires"]
             except KeyError:
                 machines = []

             for machine in machines:
-                if self._has_loop(dmap, seen=list(seen), val=machine):
+                if self._has_loop(dmap, seen=set(seen), val=machine):
                     return True
         return False