CVE-2025-64458
November 05, 2025
An issue was discovered in 5.1 before 5.1.14, 4.2 before 4.2.26, and 5.2 before 5.2.8.
NFKC normalization in Python is slow on Windows. As a consequence, "django.http.HttpResponseRedirect", "django.http.HttpResponsePermanentRedirect", and the shortcut "django.shortcuts.redirect" were subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters.
Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.
Django would like to thank Seokchan Yoon for reporting this issue.
Affected Packages
django (CONDA):
Affected version(s) >=5.0 <5.1.14Fix Suggestion:
Update to version 5.1.14django (CONDA):
Affected version(s) >=1.6.5 <4.2.26Fix Suggestion:
Update to version 4.2.26django (CONDA):
Affected version(s) >=5.2 <5.2.8Fix Suggestion:
Update to version 5.2.8https://github.com/django/django.git (GITHUB):
Affected version(s) >=5.2a1 <5.2.8Fix Suggestion:
Update to version 5.2.8https://github.com/django/django.git (GITHUB):
Affected version(s) >=1.0 <5.2.26Fix Suggestion:
Update to version 5.2.26https://github.com/django/django.git (GITHUB):
Affected version(s) >=5.0a1 <5.1.14Fix Suggestion:
Update to version 5.1.14django (PYTHON):
Affected version(s) >=5.0a1 <5.1.14Fix Suggestion:
Update to version 5.1.14django (PYTHON):
Affected version(s) >=5.2a1 <5.2.8Fix Suggestion:
Update to version 5.2.8django (PYTHON):
Affected version(s) >=1.0.1 <4.2.26Fix Suggestion:
Update to version 4.2.26Related Resources (11)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Inefficient Algorithmic Complexity
EPSS
Base Score:
0.03
