CVE-2021-44420: Potential bypass of an upstream access control based on URL paths in Django

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-12-08 · updated 2026-06-17

Description

In Django 2.2 before 2.2.25, 3.1 before 3.1.14, and 3.2 before 3.2.10, HTTP requests for URLs with trailing newlines could bypass upstream access control based on URL paths.

Affected products

Canonical Ubuntu Linux: 20.04, 21.04, 21.10
Debian Linux: 10.0, 11.0
Django: from 2.2 before 2.2.25; from 3.1 before 3.1.14; from 3.2 before 3.2.10 — fixed in 2.2.25, 3.1.14, 3.2.10
Fedoraproject Fedora: 35
Red Hat Satellite 6: 6.0
Pypi Django: from 2.2 before 2.2.25; from 3.1 before 3.1.14; from 3.2 before 3.2.10; 2.2, 2.2.1, 2.2.10, 2.2.11, 2.2.12, 2.2.13 (+43) — fixed in 2.2.25, 3.1.14, 3.2.10

How to fix

Upgrade to a fixed version: Django 2.2.25, 3.1.14, 3.2.10; Pypi Django 2.2.25, 3.1.14, 3.2.10. Check the vendor advisory for mitigations.

References

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