# Django 5.2.17 documentation

# Django 5.1.5 release notes

January 14, 2025

Django 5.1.5 fixes a security issue with severity “moderate” and one bug in 5.1.4.

## CVE-2024-56374: Potential denial-of-service vulnerability in IPv6 validation

Lack of upper bound limit enforcement in strings passed when performing IPv6 validation could lead to a potential denial-of-service attack. The undocumented and private functions `clean_ipv6_address` and `is_valid_ipv6_address` were vulnerable, as was the `django.forms.GenericIPAddressField` form field, which has now been updated to define a `max_length` of 39 characters.

The `django.db.models.GenericIPAddressField` model field was not affected.

## Bugfixes

- Fixed a crash when applying migrations with references to the removed `Meta.index_together` option (#34856).