Safety vulnerability ID: 35796
The information on this page was manually curated by our Cybersecurity Intelligence Team.
Django 2.0.3, 1.8.19 and 1.11.11 include a fix for CVE-2018-7537: An issue was discovered in Django 2.0 before 2.0.3, 1.11 before 1.11.11, and 1.8 before 1.8.19. 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.
Latest version: 5.0.4
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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
==================================================================================================================
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.
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