EmailValidator and URLValidator were subject to potential regular expression denial of service attack via a very large number of domain name labels of emails and URLs.

Affected versions: Django main development branch, Django 4.2, Django 4.1, Django 3.2

A denial of service flaw was discovered in Django. This issue occurs when incorrectly handling certain internationalized URLs. A malicious attacker could use this issue to cause a crash, resulting in a denial of service.

QuerySet.explain() method was subject to SQL injection in option names, using a suitably crafted dictionary, with dictionary expansion, as the options argument.

This issue has High severity, according to the Django security policy [1].

QuerySet.annotate(), aggregate(), and extra() methods were subject to SQL injection in column aliases, using a suitably crafted dictionary, with dictionary expansion, as the kwargs passed to these methods.

This issue has High severity, according to the Django security policy [1].

A flaw was found in python-django. The parsed values of the Accept-Language headers are cached in order to avoid repetitive parsing. This leads to a potential denial of service vector via excessive memory usage if large header values are sent.