Description
An issue was discovered in Django 6.0 before 6.0.7 and 5.2 before 5.2.16. `DomainNameValidator` does not prohibit newlines in domain names (unless used via a form field, since `CharField` strips newlines). If an application uses values with newlines in an HTTP response, header injection can occur. Django itself is unaffected because `HttpResponse` prohibits newlines in HTTP headers. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Bence Nagy for reporting this issue.
Problem types
CWE-144: Improper Neutralization of Line Delimiters
Product status
6.0 (python) before 6.0.7
6.0.7 (python)
5.2 (python) before 5.2.16
5.2.16 (python)
Timeline
| 2026-06-02: | Initial report received. |
| 2026-06-11: | Vulnerability confirmed. |
| 2026-07-07: | Security release issued. |
Credits
Bence Nagy
Natalia Bidart
Jacob Walls
References
docs.djangoproject.com/en/dev/releases/security/ (Django security archive)
groups.google.com/g/django-announce (Django releases announcements)
www.djangoproject.com/weblog/2026/jul/07/security-releases/ (Django security releases issued: 6.0.7 and 5.2.16)