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26 lines
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26 lines
1.1 KiB
Plaintext
===========================
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Django 4.1.12 release notes
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===========================
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*October 4, 2023*
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Django 4.1.12 fixes a security issue with severity "moderate" in 4.1.11.
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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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