CVE-2018-7536: Canonical Ubuntu Linux

Medium severity, CVSS 5.3. EPSS: 4.6% chance of exploitation in the next 30 days.

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. The django.utils.html.urlize() function was extremely slow to evaluate certain inputs due to catastrophic backtracking vulnerabilities in two regular expressions (only one regular expression for Django 1.8.x). The urlize() function is used to implement the urlize and urlizetrunc template filters, which were thus vulnerable.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.10 only
• Debian Debian Linux: version 7.0 only; version 8.0 only; version 9.0 only
• Djangoproject Django: from 1.8, before 1.8.19 (fixed in 1.8.19); from 1.11, before 1.11.11 (fixed in 1.11.11); from 2.0, before 2.0.3 (fixed in 2.0.3)
• Red Hat Openstack: version 10 only; version 13 only

Published 2018-03-09. Last modified 2026-06-17.