diff --git a/shared_memory_dict/dict.py b/shared_memory_dict/dict.py
index ba01f95..1eb6202 100644
--- a/shared_memory_dict/dict.py
+++ b/shared_memory_dict/dict.py
@@ -1,4 +1,5 @@
 import logging
+import os
 import sys
 import warnings
 from contextlib import contextmanager
@@ -159,11 +160,29 @@ def _get_or_create_memory_block(
         try:
             return SharedMemory(name=name)
         except FileNotFoundError:
+            self.check_security(name)
             shm = SharedMemory(name=name, create=True, size=size)
             data = self._serializer.dumps({})
             shm.buf[: len(data)] = data
             return shm
 
+    def check_security(self, name: str) -> None:
+        """Check if shared memory belongs to the current user and is only read+writeable for us"""
+        if os.name == 'nt':
+            return
+
+        if '/' in name:
+            raise TypeError('Name must not contain "/".')
+
+        shm_file = os.path.join('/dev/shm', name)
+        stat = os.stat(shm_file)
+        if (
+            stat.st_uid != os.getuid()
+            or stat.st_gid != os.getgid()
+            or stat.st_mode != 0o100600
+        ):
+            os.unlink(shm_file)
+
     def _save_memory(self, db: Dict[str, Any]) -> None:
         data = self._serializer.dumps(db)
         try: