---
title: "Django 2.1.6 release notes"
version: 4.0
locale: en
source: https://docs.djangoproject.com/en/4.0/releases/2.1.6/
canonical: https://djangodocs.dev/en/4.0/releases/2.1.6/
---
# Django 2.1.6 release notes

*February 11, 2019*

Django 2.1.6 fixes a security issue and a bug in 2.1.5.

## CVE-2019-6975: Memory exhaustion in `django.utils.numberformat.format()`

If `django.utils.numberformat.format()` – used by `contrib.admin` as well
as the `floatformat`, `filesizeformat`, and `intcomma` templates filters
– received a `Decimal` with a large number of digits or a large exponent, it
could lead to significant memory usage due to a call to `'{:f}'.format()`.

To avoid this, decimals with more than 200 digits are now formatted using
scientific notation.

### Bugfixes

- Made the `obj` argument of `InlineModelAdmin.has_add_permission()`
  optional to restore backwards compatibility with third-party code that
  doesn’t provide it ([#30097](https://code.djangoproject.com/ticket/30097)).