Django 3.1.8 release notes
April 6, 2021
Django 3.1.8 fixes a security issue with severity “low” and a bug in 3.1.7.
CVE-2021-28658: Potential directory-traversal via uploaded files
MultiPartParser
allowed directory-traversal via uploaded files with suitably crafted file names.
Built-in upload handlers were not affected by this vulnerability.