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.

Bugfixes

• Fixed a bug in Django 4.1 that caused a crash of model validation on UniqueConstraint with ordered expressions (#34291).