Django Improper Limitation of a Pathname to a Restricted Directory (Path Traversal) Vulnerability - CVE-2021-28658
In Django 2.2 before 2.2.20 3.0 before 3.0.14 and 3.1 before 3.1.8 MultiPartParser allowed directory traversal via uploaded files with suitably crafted file names. Built-in upload handlers were not affected by this vulnerability.