Django vulnerable to ASGI header spoofing via underscore/hyphen conflation
GHSA-mvfq-ggxm-9mc5 · BIT-django-2026-3902 · CVE-2026-3902 · PYSEC-2026-51
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Description
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.
References
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-3902
- WEB https://docs.djangoproject.com/en/dev/releases/security
- PACKAGE https://github.com/django/django
- WEB https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-51.yaml
- WEB https://groups.google.com/g/django-announce
- WEB https://www.djangoproject.com/weblog/2026/apr/07/security-releases
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