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.
CVE-2026-84429
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-84429
Django
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/django/django/",
"vendor": "djangoproject",
"product": "Django",
"versions": [
{
"status": "affected",
"version": "6.1",
"lessThan": "6.1.2",
"versionType": "python"
},
{
"status": "unaffected",
"version": "6.1.2",
"versionType": "python"
},
{
"status": "affected",
"version": "6.0",
"lessThan": "6.0.9",
"versionType": "python"
},
{
"status": "unaffected",
"version": "6.0.9",
"versionType": "python"
},
{
"status": "affected",
"version": "5.2",
"lessThan": "5.2.18",
"versionType": "python"
},
{
"status": "unaffected",
"version": "5.2.18",
"versionType": "python"
}
],
"packageName": "django",
"collectionURL": "https://pypi.org/project/Django/",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-84429
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #9317 · Revision 1
- Added to Heist Feed
- Publisher date