{"id":"CVE-2026-84429","title":"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.\n`django.utils.http.parse_header_parameters()` was subject to a potential denial-of-service attack due to quadratic time complexity when parsing …","summary":"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.\n`django.utils.http.parse_header_parameters()` was subject to a potential denial-of-service attack due to quadratic time complexity when parsing …","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-407","CWE-400"],"vendor":"djangoproject","product":"django","affected":["django >= 6.1 < 6.1.2","django >= 6.0 < 6.0.9","django >= 5.2 < 5.2.18"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T15:17:19.860","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84429","references":[{"url":"https://docs.djangoproject.com/en/dev/releases/security/","label":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://github.com/django/django/commit/3d8f121695c21234aff3071de0d38b6bd38c3f52","label":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://github.com/django/django/commit/6ecd66e09a383be004a78a3a738ea9727ff07b0e","label":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://github.com/django/django/commit/7ff7fcc0508864a4bc39693128ace38b1e95a890","label":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://github.com/django/django/commit/de56deeabd4c48dfb5193f0001469d80102fb367","label":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://groups.google.com/g/django-announce","label":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://www.djangoproject.com/weblog/2026/oct/06/security-releases/","label":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84429.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-84429"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2544147"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84429"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84429"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-06T14:12:40.577982Z"},"ingestedAt":"2026-10-06T14:00:19.152Z","epss":0.00483,"epssPercentile":0.41416,"slug":"CVE-2026-84429","body":"## Overview\n\nAn issue was discovered in Django 6.1 before 6.1.2, 6.0 before 6.0.9, and 5.2 before 5.2.18.\n`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.\nEarlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected.\nDjango would like to thank Jisung Chae for reporting this issue.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Ansible Automation Platform 2, Red Hat Discovery 2, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0, … · no fix planned: Red Hat Ansible Automation Platform 2, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, … · updated 2026-10-06 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84429.json)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}