An issue was discovered in Django 3.2 before 3.2.23, 4.1 before 4.1.13, and 4.2 before 4.2.7. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.forms.UsernameField is subject to a potential DoS (denial of service) attack via certain inputs with a very large number of Unicode characters.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| Django(PyPI) | 3.2a1 | 3.2.23 | N/A |
| Django(PyPI) | 4.1a1 | 4.1.13 | N/A |
| Django(PyPI) | 4.2a1 | 4.2.7 | N/A |
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