Description
An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.views.LoginView, django.contrib.auth.views.LogoutView, and django.views.i18n.set_language are subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters.
Published: 2025-04-02
Score: 5.8 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2025-9536 An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.views.LoginView, django.contrib.auth.views.LogoutView, and django.views.i18n.set_language are subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters.
Github GHSA Github GHSA GHSA-wqfg-m96j-85vm Django Potential Denial of Service (DoS) on Windows
History

Fri, 03 Oct 2025 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft
Microsoft windows
CPEs cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows

Thu, 03 Apr 2025 02:00:00 +0000

Type Values Removed Values Added
Title django: Django DoS Unicode Attack
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 02 Apr 2025 22:45:00 +0000

Type Values Removed Values Added
References

Wed, 02 Apr 2025 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 02 Apr 2025 13:00:00 +0000

Type Values Removed Values Added
Description An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.views.LoginView, django.contrib.auth.views.LogoutView, and django.views.i18n.set_language are subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters.
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L'}


Subscriptions

Djangoproject Django
Microsoft Windows
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-04-02T22:03:22.423Z

Reserved: 2025-03-02T00:00:00.000Z

Link: CVE-2025-27556

cve-icon Vulnrichment

Updated: 2025-04-02T22:03:22.423Z

cve-icon NVD

Status : Analyzed

Published: 2025-04-02T13:15:44.373

Modified: 2025-10-03T15:34:09.950

Link: CVE-2025-27556

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-04-02T00:00:00Z

Links: CVE-2025-27556 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-07-12T15:26:10Z

Weaknesses