CVE-2021-45115: Djangoproject Django

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

An issue was discovered in Django 2.2 before 2.2.26, 3.2 before 3.2.11, and 4.0 before 4.0.1. UserAttributeSimilarityValidator incurred significant overhead in evaluating a submitted password that was artificially large in relation to the comparison values. In a situation where access to user registration was unrestricted, this provided a potential vector for a denial-of-service attack.

Affected products

• Djangoproject Django: from 2.2, before 2.2.26 (fixed in 2.2.26); from 3.2, before 3.2.11 (fixed in 3.2.11); from 4.0, before 4.0.1 (fixed in 4.0.1)
• Fedoraproject Fedora: version 35 only

Published 2022-01-05. Last modified 2026-06-17.