CVE-2026-53878 Header injection possibility since DomainNameValidator accepted newlines in input
Attackers can inject HTTP headers if applications use unvalidated domain names with newlines in responses, requiring specific application logic to exploit.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-53878?
CVE-2026-53878 is a medium-severity vulnerability in Djangoproject Django, published on 7 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-144
Which versions are affected by CVE-2026-53878?
6 open source packages ship an affected version, including django. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
django Bitnami | From 5.2.0 | 5.2.16, 6.0.7 |
django PyPI | All versions | 5.2.16 |
django PyPI | All versions | 5.2.16 |
django PyPI | From 5.2 | 5.2.16, 6.0.7 |
django PyPI | From 6.0.0 | 6.0.7 |
django PyPI | From 6.0.0 | 6.0.7 |
Products include Djangoproject Django.
How do I fix CVE-2026-53878?
Upgrade django to a fixed version for your release line: 5.2.16 or 6.0.7.
Is CVE-2026-53878 being exploited?
There is no known exploitation of CVE-2026-53878 in the wild and no public exploit code.
Other vulnerabilities in Djangoproject Django
- CVE-2026-4277 Privilege abuse in GenericInlineModelAdmin
- CVE-2024-53908 Django SQL injection in HasKey(lhs, rhs) on Oracle
- CVE-2024-42005 Django SQL injection vulnerability
- CVE-2023-31047 Django bypasses validation when using one form field to upload multiple files
- CVE-2022-34265 Django `Trunc()` and `Extract()` database functions vulnerable to SQL Injection
Sources
Also known as BIT-django-2026-53878, CLSA-2026-1791536614, DEBIAN-CVE-2026-53878, ECHO-bc1b-1076-f725, GHSA-8qcx-xf44-272x, MINI-3w53-mpfr-34jp and 3 more.