diff --git a/ojs_updater/ojsinstance.py b/ojs_updater/ojsinstance.py
index c409813..e7a45ab 100644
--- a/ojs_updater/ojsinstance.py
+++ b/ojs_updater/ojsinstance.py
@@ -264,7 +264,29 @@ def _rewind(self):
             if www_backup.endswith('.bz2'):
                 with tarfile.open(str(www_backup), mode='r:bz2') as www_tar:
                     self.logger.info('Extract to: %s', self.base_folder.parent)
-                    www_tar.extractall(path=self.base_folder.parent)
+                    
+                    import os
+                    
+                    def is_within_directory(directory, target):
+                        
+                        abs_directory = os.path.abspath(directory)
+                        abs_target = os.path.abspath(target)
+                    
+                        prefix = os.path.commonprefix([abs_directory, abs_target])
+                        
+                        return prefix == abs_directory
+                    
+                    def safe_extract(tar, path=".", members=None, *, numeric_owner=False):
+                    
+                        for member in tar.getmembers():
+                            member_path = os.path.join(path, member.name)
+                            if not is_within_directory(path, member_path):
+                                raise Exception("Attempted Path Traversal in Tar File")
+                    
+                        tar.extractall(path, members, numeric_owner=numeric_owner) 
+                        
+                    
+                    safe_extract(www_tar, path=self.base_folder.parent)
 
     @contextmanager
     def lock(self):