What's New in Python 2.3.5?
+*Release date: -2005*
disables recursive traversal through instance attributes, which can
be exploited in various ways.
+- Bug #1114776. Applied a fix to the copy.py fix in 2.3.5rc1 to deal
+ with types that don't have an __mro__.
What's New in Python 2.3.5rc1?