docs/releases/2.2.21.txt from django/django

docs/releases/2.2.21.txt

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Issues

===========================
Django 2.2.21 release notes
===========================

*May 4, 2021*

Django 2.2.21 fixes a security issue in 2.2.20.

CVE-2021-31542: Potential directory-traversal via uploaded files
================================================================

``MultiPartParser``, ``UploadedFile``, and ``FieldFile`` allowed
directory-traversal via uploaded files with suitably crafted file names.

In order to mitigate this risk, stricter basename and path sanitation is now
applied.