Vulnerability-Lookup

GHSA-76G2-X83X-73R7

Vulnerability from github – Published: 2026-10-06 15:32 – Updated: 2026-10-06 15:32

Details

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.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-84429"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-407"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-06T14:17:46Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-76g2-x83x-73r7",
  "modified": "2026-10-06T15:32:00Z",
  "published": "2026-10-06T15:32:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84429"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django/django/commit/3d8f121695c21234aff3071de0d38b6bd38c3f52"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django/django/commit/6ecd66e09a383be004a78a3a738ea9727ff07b0e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django/django/commit/7ff7fcc0508864a4bc39693128ace38b1e95a890"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django/django/commit/de56deeabd4c48dfb5193f0001469d80102fb367"
    },
    {
      "type": "WEB",
      "url": "https://docs.djangoproject.com/en/dev/releases/security"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/django-announce"
    },
    {
      "type": "WEB",
      "url": "https://www.djangoproject.com/weblog/2026/oct/06/security-releases"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-84429 (GCVE-0-2026-84429)

Vulnerability from cvelistv5 – Published: 2026-10-06 13:35 – Updated: 2026-10-06 14:15

Title

Potential denial-of-service vulnerability in HTTP header 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. `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.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-06 14:12 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

DSF mitre root Scorecard

References

7 references

URL	Tags
https://docs.djangoproject.com/en/dev/releases/se…	vendor-advisory
https://groups.google.com/g/django-announce	mailing-list
https://github.com/django/django/commit/7ff7fcc05…	patch
https://github.com/django/django/commit/de56deeab…	patch
https://github.com/django/django/commit/3d8f12169…	patch
https://github.com/django/django/commit/6ecd66e09…	patch
https://www.djangoproject.com/weblog/2026/oct/06/…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
djangoproject	Django	Affected: 6.1 , < 6.1.2 (python) Unaffected: 6.1.2 (python) Affected: 6.0 , < 6.0.9 (python) Unaffected: 6.0.9 (python) Affected: 5.2 , < 5.2.18 (python) Unaffected: 5.2.18 (python)

Date Public

2026-10-06 08:00

Credits

Jisung Chae Peter Thomassen Bruno Alla Natalia Bidart Natalia Bidart Khudyakov Artem Ben Cail Jake Howard Sarah Boyce Jacob Walls Mike Edmunds David Smith Sarah Boyce

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JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-76G2-X83X-73R7

CVE-2026-84429 (GCVE-0-2026-84429)

Tags

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Nomenclature

Related by attack behaviour