CVE-2026-84429Potential denial-of-service vulnerability in HTTP header parsing
Updated under an hour ago ()
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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
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-407
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- DSF
- NVD analysis
- Deferred
- Record last updated
- Oct 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
djangoproject Django djangoproject:django (from the name) | from 6.1 before 6.1.2; 6.1.2 not affected; from 6.0 before 6.0.9; 6.0.9 not affected; from 5.2 before 5.2.18; 5.2.18 not affected | CNA record |
References
- https://docs.djangoproject.com/en/dev/releases/security/vendor-advisory
- https://groups.google.com/g/django-announcemailing-list
- https://github.com/django/django/commit/7ff7fcc0508864a4bc39693128ace38b1e95a890patch
- https://github.com/django/django/commit/de56deeabd4c48dfb5193f0001469d80102fb367patch
- https://github.com/django/django/commit/3d8f121695c21234aff3071de0d38b6bd38c3f52patch
- https://github.com/django/django/commit/6ecd66e09a383be004a78a3a738ea9727ff07b0epatch
- https://www.djangoproject.com/weblog/2026/oct/06/security-releases/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.