`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.
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Tue, 06 Oct 2026 15:30:00 +0000
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Tue, 06 Oct 2026 13:45:00 +0000
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| 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. `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. | |
| Title | Potential denial-of-service vulnerability in HTTP header parsing | |
| Weaknesses | CWE-407 | |
| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: DSF
Published:
Updated: 2026-10-06T14:15:10.916Z
Reserved: 2026-09-01T18:34:27.131Z
Link: CVE-2026-84429
Updated: 2026-10-06T14:15:05.715Z
Status : Deferred
Published: 2026-10-06T14:17:46.910
Modified: 2026-10-06T15:17:19.860
Link: CVE-2026-84429
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OpenCVE Enrichment
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