high7.5
CVE-2026-3902
An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30.
Impact
An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30. `ASGIRequest` allows a remote attacker to spoof headers by exploiting an ambiguous mapping of two header variants (with hyphens or with underscores) to a single version with underscores. 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 Tarek Nakkouch for reporting this issue.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | Django | >= 6.0, < 6.0.4 | 6.0.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Djangoproject | Django | from 4.2 before 4.2.30 from 5.2 before 5.2.13 from 6.0 before 6.0.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://docs.djangoproject.com/en/dev/releases/security/
- https://groups.google.com/g/django-announce
- https://www.djangoproject.com/weblog/2026/apr/07/security-releases/
- https://github.com/advisories/GHSA-mvfq-ggxm-9mc5
- https://nvd.nist.gov/vuln/detail/CVE-2026-3902
- https://docs.djangoproject.com/en/dev/releases/security
- https://www.djangoproject.com/weblog/2026/apr/07/security-releases
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-51.yaml