===========================

Django 3.2.22 release notes

===========================

*October 4, 2023*

Django 3.2.22 fixes a security issue with severity "moderate" in 3.2.21.

CVE-2023-43665: Denial-of-service possibility in ``django.utils.text.Truncator``

================================================================================

Following the fix for :cve:`2019-14232`, the regular expressions used in the

implementation of ``django.utils.text.Truncator``'s ``chars()`` and ``words()``

methods (with ``html=True``) were revised and improved. However, these regular

expressions still exhibited linear backtracking complexity, so when given a

very long, potentially malformed HTML input, the evaluation would still be

slow, leading to a potential denial of service vulnerability.

The ``chars()`` and ``words()`` methods are used to implement the

:tfilter:`truncatechars_html` and :tfilter:`truncatewords_html` template

filters, which were thus also vulnerable.

The input processed by ``Truncator``, when operating in HTML mode, has been

limited to the first five million characters in order to avoid potential

performance and memory issues.