Django 1.5.5 fixes a couple security-related bugs and several other bugs in the 1.5 series.
Readdressed denial-of-service via password hashers
Django 1.5.4 imposes a 4096-byte limit on passwords in order to mitigate a denial-of-service attack through submission of bogus but extremely large passwords. In Django 1.5.5, we’ve reverted this change and instead improved the speed of our PBKDF2 algorithm by not rehashing the key on every iteration.
Properly rotate CSRF token on login
This behaviour introduced as a security hardening measure in Django 1.5.2 did not work properly and is now fixed.
Bugfixes
Fixed a data corruption bug with datetime_safe.datetime.combine.
Fixed a Python 3 incompatability in django.utils.text.unescape_entities().
Fixed a couple data corruption issues with QuerySet edge cases under Oracle and MySQL.
Fixed crashes when using combinations of annotate(), select_related(), and only()
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