High severity · published Apr 2, 2025
CVE-2025-27556
An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14
7.5
CVSS
1.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DJ
Django · Djangoproject
5.0 before 5.0.14; 5.1 before 5.1.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-27556
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-27556
Vendor Advisory
https://docs.djangoproject.com/en/dev/releases/security/
Vendor Advisory
https://groups.google.com/g/django-announce
Vendor Advisory
https://www.djangoproject.com/weblog/2025/apr/02/security-releases/
Mailing List
http://www.openwall.com/lists/oss-security/2025/04/02/2
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