{"id":"CVE-2026-84429","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-84429","generatedAt":"2026-10-28T03:27:41.243Z","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. `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…","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.\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.","published":"2026-10-06T14:17:47.000Z","lastModified":"2026-10-06T15:17:20.000Z","status":"Deferred","sourceIdentifier":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92","cvss":{"version":"4.0","score":6.9,"severity":"MEDIUM","vector":"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/M"},"cwe":["CWE-407"],"affected":[],"epss":{"score":0.00483,"percentile":0.41342,"date":"2026-10-26","history":[{"date":"2026-10-07","score":0.00381,"percentile":0.29984}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.48%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-06T14:17:47.000Z","detail":{"score":"6.9","severity":"MEDIUM","publishedAt":"2026-10-06T14:17:46.910Z"},"summary":"New CVE, medium severity (CVSS 6.9)."}],"references":[{"url":"https://docs.djangoproject.com/en/dev/releases/security/","source":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://github.com/django/django/commit/3d8f121695c21234aff3071de0d38b6bd38c3f52","source":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://github.com/django/django/commit/6ecd66e09a383be004a78a3a738ea9727ff07b0e","source":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://github.com/django/django/commit/7ff7fcc0508864a4bc39693128ace38b1e95a890","source":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://github.com/django/django/commit/de56deeabd4c48dfb5193f0001469d80102fb367","source":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://groups.google.com/g/django-announce","source":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"},{"url":"https://www.djangoproject.com/weblog/2026/oct/06/security-releases/","source":"6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-84429","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}