---
title: "Django 4.0.9 release notes"
version: 5.0
locale: fr
source: https://docs.djangoproject.com/fr/5.0/releases/4.0.9/
canonical: https://djangodocs.dev/fr/5.0/releases/4.0.9/
---
# Django 4.0.9 release notes

*February 1, 2023*

Django 4.0.9 fixes a security issue with severity « moderate » in 4.0.8.

## CVE-2023-23969: Potential denial-of-service via `Accept-Language` headers

The parsed values of `Accept-Language` headers are cached in order to avoid
repetitive parsing. This leads to a potential denial-of-service vector via
excessive memory usage if large header values are sent.

In order to avoid this vulnerability, the `Accept-Language` header is now
parsed up to a maximum length.