# Django 6.0.7 - dokumentacja

# Django 4.2.21 release notes

May 7, 2025

Django 4.2.21 fixes a security issue with severity „moderate”, a data loss bug, and a regression in 4.2.20.

This release was built using an upgraded setuptools, producing filenames compliant with PEP 491 and PEP 625 and thus addressing a PyPI warning about non-compliant distribution filenames. This change only affects the Django packaging process and does not impact Django’s behavior.

## CVE-2025-32873: Denial-of-service possibility in `strip_tags()`

`strip_tags()` would be slow to evaluate certain inputs containing large sequences of incomplete HTML tags. This function is used to implement the `striptags` template filter, which was thus also vulnerable.

`strip_tags()` now raises a `SuspiciousOperation` exception if it encounters an unusually large number of unclosed opening tags.

## Poprawki błędów

- Fixed a data corruption possibility in `file_move_safe()` when `allow_overwrite=True`, where leftover content from a previously larger file could remain after overwriting with a smaller one due to lack of truncation (#36298).

- Fixed a regression in Django 4.2.20, introduced when fixing CVE 2025-26699, where the `wordwrap` template filter did not preserve empty lines between paragraphs after wrapping text (#36341).