CVE-2026-3902
unknown
CVSS v3
—
CVSS v2
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VIR risk
—
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.
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-3902
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-3902.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 3:4.2.30-1 |
| debian | sid | fixed | 3:4.2.30-1 |
| debian | trixie | affected | |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-3902
- https://docs.djangoproject.com/en/dev/releases/security
- https://github.com/django/django
- https://groups.google.com/g/django-announce
- https://www.djangoproject.com/weblog/2026/apr/07/security-releases
- https://docs.djangoproject.com/en/dev/releases/security/
- https://www.djangoproject.com/weblog/2026/apr/07/security-releases/
- https://www.suse.com/security/cve/CVE-2026-3902.html
- https://security-tracker.debian.org/tracker/CVE-2026-3902
Verify integrity in audit chain (admin only). AS-IS.