CVE-2026-3902
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
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Fixed | 3:4.2.30-1 |
| forky | Fixed | 3:4.2.30-1 |
| bullseye | Affected | — |
| bookworm | 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
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.