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django/docs/releases/4.0.9.txt
Nick Pope 8c660fb592 Fixed CVE-2023-23969 -- Prevented DoS with pathological values for Accept-Language.
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 the raw value of Accept-Language
headers is very large.

Accept-Language headers are now limited to a maximum length in order
to avoid this issue.
2023-02-01 09:44:04 +01:00

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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.