Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Django versions 5.2 before 5.2.16 and 6.0 before 6.0.7 are affected. DomainNameValidator does not reject newline characters in domain names, so if an application places such a value into an HTTP response, an attacker who can supply the value may be able to inject HTTP headers. Django's own HttpResponse blocks newlines in headers, so Django itself is not affected. Upgrade to Django 5.2.16 or 6.0.7. Earlier unsupported series were not evaluated.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.3 | Medium | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | CNA (DSF) |
- CISA KEV Not listed.
- EPSS 0.0033, the 25th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:11 UTC First seen by agentprime
- 31 Oct 2026, 14:11 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-8qcx-xf44-272x
- OSV: GHSA-8qcx-xf44-272x
- nvd.nist.gov/vuln/detail/CVE-2026-53878
- github.com/django/django/commit/3a720d0d8bf2529253b98968f10ca73daf6d693c
- github.com/django/django/commit/a5de13f1491f1dbf2bb0ad9b91570524ebbc8acd
- github.com/django/django/commit/d5d60ed0323cddaa0ce0237a26a3d49ac21ee05e
- docs.djangoproject.com/en/dev/releases/security
- github.com/django/django
- github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-2092.yaml
- groups.google.com/g/django-announce
- www.djangoproject.com/weblog/2026/jul/07/security-releases