Description
An issue was discovered in Django 4.2 before 4.2.21, 5.1 before 5.1.9, and 5.2 before 5.2.1. The django.utils.html.strip_tags() function is vulnerable to a potential denial-of-service (slow performance) when processing inputs containing large sequences of incomplete HTML tags. The template filter striptags is also vulnerable, because it is built on top of strip_tags().
Problem types
CWE-770 Allocation of Resources Without Limits or Throttling
Product status
4.2 (custom) before 4.2.21
5.1 (custom) before 5.1.9
5.2 (custom) before 5.2.1
References
www.openwall.com/lists/oss-security/2025/05/07/1
docs.djangoproject.com/en/dev/releases/security/
groups.google.com/g/django-announce
www.djangoproject.com/weblog/2025/may/07/security-releases/
