---
title: "Django 4.1.6 release notes"
version: 5.2
locale: pl
source: https://docs.djangoproject.com/pl/5.2/releases/4.1.6/
canonical: https://djangodocs.dev/pl/5.2/releases/4.1.6/
---
# Django 4.1.6 release notes

*February 1, 2023*

Django 4.1.6 fixes a security issue with severity „moderate” and a bug in
4.1.5.

## 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.

## Poprawki błędów

- Fixed a bug in Django 4.1 that caused a crash of model validation on
  `UniqueConstraint` with ordered expressions ([#34291](https://code.djangoproject.com/ticket/34291)).