6.9

CVE-2026-84429

Potential denial-of-service vulnerability in HTTP header parsing

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstellerdjangoproject
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Produkt Django
Default Statusunaffected
Version 6.1
Version < 6.1.2
Status affected
Version 6.1.2
Status unaffected
Version 6.0
Version < 6.0.9
Status affected
Version 6.0.9
Status unaffected
Version 5.2
Version < 5.2.18
Status affected
Version 5.2.18
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.38% 0.3
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 6.9 0 0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 5.3 3.9 1.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-407 Inefficient Algorithmic Complexity

An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

https://docs.djangoproject.com/en/dev/releases/security/
https://groups.google.com/g/django-announce
https://www.djangoproject.com/weblog/2026/oct/06/security-releases/
https://github.com/django/django/commit/7ff7fcc0508864a4bc39693128ace38b1e95a890
https://github.com/django/django/commit/de56deeabd4c48dfb5193f0001469d80102fb367
https://github.com/django/django/commit/3d8f121695c21234aff3071de0d38b6bd38c3f52
https://github.com/django/django/commit/6ecd66e09a383be004a78a3a738ea9727ff07b0e