Vulnerability · Published Jul 7, 2026 · Assigned by DSF
CVE-2026-53878Header injection possibility since DomainNameValidator accepted newlines in input
Medium 6.1
In plain English
A medium-severity security flaw in Django from djangoproject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | py3-django | 5.2.16-r0 | ALPINE-CVE-2026-53878 |
| Debian:13 | python-django | no fix listed | DEBIAN-CVE-2026-53878 |
| Debian:14 | python-django | 3:5.2.16-1 | DEBIAN-CVE-2026-53878 |
| PyPI | django | 5.2.16 | GHSA-8qcx-xf44-272x |
| PyPI | django | 5.2.16, 6.0.7 | PYSEC-2026-2092 |
| PyPI | django | 6.0.7 | GHSA-8qcx-xf44-272x |
| Ubuntu:22.04:LTS | python-django | no fix listed | UBUNTU-CVE-2026-53878 |
| Ubuntu:24.04:LTS | python-django | no fix listed | UBUNTU-CVE-2026-53878 |
| Ubuntu:25.10 | python-django | no fix listed | UBUNTU-CVE-2026-53878 |
| Ubuntu:26.04:LTS | python-django | no fix listed | UBUNTU-CVE-2026-53878 |
| Ubuntu:26.10 | python-django | no fix listed | UBUNTU-CVE-2026-53878 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| djangoproject | Django | 6.0 – before 6.0.75.2 – before 5.2.16 |
Weakness: CWE-144 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- Django security archive vendor-advisory
- Django releases announcements mailing-list
- Django security releases issued: 6.0.7 and 5.2.16 vendor-advisory