CVE-2026-3902

HIGH 7.5

ASGI header spoofing via underscore/hyphen conflation

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-290
Vendor	djangoproject
Product	django
Published	Apr 7, 2026
Last Updated	Apr 7, 2026

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Affected Versions

djangoproject / Django

6.0 < 6.0.4 5.2 < 5.2.13 4.2 < 4.2.30

References

NVD ↗ CVE.org ↗ EPSS Data ↗

docs.djangoproject.com: https://docs.djangoproject.com/en/dev/releases/security/ groups.google.com: https://groups.google.com/g/django-announce djangoproject.com: https://www.djangoproject.com/weblog/2026/apr/07/security-releases/

Credits

🔍 Tarek Nakkouch Jacob Walls Jacob Walls