========================== 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.