django/docs/releases/2.2.26.txt

===========================
Django 2.2.26 release notes
===========================

*January 4, 2022*

Django 2.2.26 fixes one security issue with severity "medium" and two security
issues with severity "low" in 2.2.25.

CVE-2021-45115: Denial-of-service possibility in ``UserAttributeSimilarityValidator``
=====================================================================================

:class:`.UserAttributeSimilarityValidator` incurred significant overhead
evaluating submitted password that were artificially large in relative to the
comparison values. On the assumption that access to user registration was
unrestricted this provided a potential vector for a denial-of-service attack.

In order to mitigate this issue, relatively long values are now ignored by
``UserAttributeSimilarityValidator``.

This issue has severity "medium" according to the :ref:`Django security policy
<security-disclosure>`.

CVE-2021-45116: Potential information disclosure in ``dictsort`` template filter
================================================================================

Due to leveraging the Django Template Language's variable resolution logic, the
:tfilter:`dictsort` template filter was potentially vulnerable to information
disclosure or unintended method calls, if passed a suitably crafted key.

In order to avoid this possibility, ``dictsort`` now works with a restricted
resolution logic, that will not call methods, nor allow indexing on
dictionaries.

As a reminder, all untrusted user input should be validated before use.
CVE-2021-45452: Potential directory-traversal via ``Storage.save()``
====================================================================

``Storage.save()`` allowed directory-traversal if directly passed suitably
crafted file names.

This issue has severity "low" according to the :ref:`Django security policy
<security-disclosure>`.