A python-django security update has been released for both Debian GNU/Linux 9 and 10.

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Debian Security Advisory DSA-4598-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
January 07, 2020   https://www.debian.org/security/faq
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Package : python-django
CVE ID : CVE-2019-19844
Debian Bug : 946937

Simon Charette reported that the password reset functionality in Django,
a high-level Python web development framework, uses a Unicode
case-insensitive query to retrieve accounts matching the email address
requesting the password reset. An attacker can take advantage of this
flaw to potentially retrieve password reset tokens and hijack accounts.

For details please refer to
  https://www.djangoproject.com/weblog/2019/dec/18/security-releases/

For the oldstable distribution (stretch), this problem has been fixed
in version 1:1.10.7-2+deb9u7.

For the stable distribution (buster), this problem has been fixed in
version 1:1.11.27-1~deb10u1.

We recommend that you upgrade your python-django packages.

For the detailed security status of python-django please refer to its
security tracker page at:
  https://security-tracker.debian.org/tracker/python-django

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/