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51 lines
2.1 KiB
Plaintext
51 lines
2.1 KiB
Plaintext
==========================
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Django 4.2.6 release notes
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==========================
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*October 4, 2023*
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Django 4.2.6 fixes a security issue with severity "moderate" and several bugs
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in 4.2.5.
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CVE-2023-43665: Denial-of-service possibility in ``django.utils.text.Truncator``
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================================================================================
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Following the fix for :cve:`2019-14232`, the regular expressions used in the
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implementation of ``django.utils.text.Truncator``'s ``chars()`` and ``words()``
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methods (with ``html=True``) were revised and improved. However, these regular
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expressions still exhibited linear backtracking complexity, so when given a
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very long, potentially malformed HTML input, the evaluation would still be
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slow, leading to a potential denial of service vulnerability.
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The ``chars()`` and ``words()`` methods are used to implement the
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:tfilter:`truncatechars_html` and :tfilter:`truncatewords_html` template
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filters, which were thus also vulnerable.
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The input processed by ``Truncator``, when operating in HTML mode, has been
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limited to the first five million characters in order to avoid potential
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performance and memory issues.
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Bugfixes
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========
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* Fixed a regression in Django 4.2.5 where overriding the deprecated
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``DEFAULT_FILE_STORAGE`` and ``STATICFILES_STORAGE`` settings in tests caused
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the main ``STORAGES`` to mutate (:ticket:`34821`).
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* Fixed a regression in Django 4.2 that caused unnecessary casting of string
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based fields (``CharField``, ``EmailField``, ``TextField``, ``CICharField``,
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``CIEmailField``, and ``CITextField``) used with the ``__isnull`` lookup on
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PostgreSQL. As a consequence, indexes using an ``__isnull`` expression or
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condition created before Django 4.2 wouldn't be used by the query planner,
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leading to a performance regression (:ticket:`34840`).
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You may need to recreate such indexes created in your database with Django
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4.2 to 4.2.5, as they contain unnecessary ``::text`` casting. Find candidate
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indexes with this query:
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.. code-block:: sql
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SELECT indexname, indexdef
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FROM pg_indexes
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WHERE indexdef LIKE '%::text IS %NULL';
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