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Django 3.1.9 release notes
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*May 4, 2021*

Django 3.1.9 fixes a security issue in 3.1.8.

CVE-2021-31542: Potential directory-traversal via uploaded files
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``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.