CVE-2026-84429
Description
An issue was discovered in Django 6.1 before 6.1.2, 6.0 before 6.0.9, and 5.2 before 5.2.18. `django.utils.http.parse_header_parameters()` was subject to a potential denial-of-service attack due to quadratic time complexity when parsing a value with many separators inside a quoted parameter. An unauthenticated request could reach this parsing through headers such as `Accept` or `Content-Type`, for instance via the content negotiation performed by `HttpRequest.accepts()`. The per-call length limit does not bound the combined size of repeated headers. Earlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected. Django would like to thank Jisung Chae 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.
References
- https://docs.djangoproject.com/en/dev/releases/security/
- https://github.com/django/django/commit/3d8f121695c21234aff3071de0d38b6bd38c3f52
- https://github.com/django/django/commit/6ecd66e09a383be004a78a3a738ea9727ff07b0e
- https://github.com/django/django/commit/7ff7fcc0508864a4bc39693128ace38b1e95a890
- https://github.com/django/django/commit/de56deeabd4c48dfb5193f0001469d80102fb367
- https://groups.google.com/g/django-announce
- https://www.djangoproject.com/weblog/2026/oct/06/security-releases/
CWEs
CWE-407
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.