CVE-2026-84429
mediumAn issue was discovered in Django 6.1 before 6.1.2, 6.0 before 6.0.9, and 5.2 before 5.2.18.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://docs.djangoproject.com/en/dev/releases/security/ 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://github.com/django/django/commit/3d8f121695c21234aff3071de0d38b6bd38c3f52 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://github.com/django/django/commit/6ecd66e09a383be004a78a3a738ea9727ff07b0e 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://github.com/django/django/commit/7ff7fcc0508864a4bc39693128ace38b1e95a890 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://github.com/django/django/commit/de56deeabd4c48dfb5193f0001469d80102fb367 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://groups.google.com/g/django-announce 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- https://www.djangoproject.com/weblog/2026/oct/06/security-releases/ 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92