---
title: "Django 1.8.19 release notes"
version: 3.1
locale: es
source: https://docs.djangoproject.com/es/3.1/releases/1.8.19/
canonical: https://djangodocs.dev/es/3.1/releases/1.8.19/
---
# Django 1.8.19 release notes

*March 6, 2018*

Django 1.8.19 fixes two security issues in 1.18.18.

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

The `django.utils.html.urlize()` function was extremely slow to evaluate
certain inputs due to a catastrophic backtracking vulnerability in a regular
expression. The `urlize()` function is used to implement the `urlize` and
`urlizetrunc` template filters, which were thus vulnerable.

The problematic regular expression is 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.