Description
An issue was discovered in Django 1.11.x before 1.11.23, 2.1.x before 2.1.11, and 2.2.x before 2.2.4. 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.
Remediation
References
Related Vulnerabilities
WordPress Plugin Woody ad snippets-Insert Header Footer Code, AdSense Ads PHP Code Injection (1.3)
WordPress 2.5 Cross-Site Scripting Vulnerability (2.5)
WordPress Plugin MPL-Publisher-Create your Ebook & Audiobook Cross-Site Scripting (1.30.2)
Oracle Database Server CVE-2015-0457 Vulnerability (CVE-2015-0457)