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Django 1.11.11 release notes

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*March 6, 2018*

Django 1.11.11 fixes two security issues in 1.11.10.

CVE-2018-7536: Denial-of-service possibility in ``urlize`` and ``urlizetrunc`` template filters

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The ``django.utils.html.urlize()`` function was extremely slow to evaluate

certain inputs due to catastrophic backtracking vulnerabilities in two regular

expressions. The ``urlize()`` function is used to implement the ``urlize`` and

``urlizetrunc`` template filters, which were thus vulnerable.

The problematic regular expressions are replaced with parsing logic that

behaves similarly.

CVE-2018-7537: Denial-of-service possibility in ``truncatechars_html`` and ``truncatewords_html`` template filters

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If ``django.utils.text.Truncator``'s ``chars()`` and ``words()`` methods were

passed the ``html=True`` argument, they were extremely slow to evaluate certain

inputs due to a catastrophic backtracking vulnerability in a regular

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

``truncatechars_html`` and ``truncatewords_html`` template filters, which were

thus vulnerable.

The backtracking problem in the regular expression is fixed.