Django 2.2.20 release notes — Django documentation
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Django/docs/3.2.x/releases/2.2.20
Django 2.2.20 release notes
April 6, 2021
Django 2.2.20 fixes a security issue with severity “low” in 2.2.19.
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.