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CVE-2026-25673

Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows

Published: Mar 3, 2026Updated: Mar 5, 2026 Sources: CVE List NVD GHSA BDUCWE-400
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.6%
Top 54.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. `URLField.to_python()` in Django calls `urllib.parse.urlsplit()`, which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these 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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-400CWE-770

Affected Products

djangodjangoprojectOSS Libraries
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
DjangoDjango Software Foundation
LibraryLibrary
OSS Libraries / web-framework
DjangoPyPIOSS Libraries
DjangodjangoprojectOSS Libraries
djangoprojectoss-projectOSS Librariesaka django
ооо «ред софт»commercialRUOperating Systemsaka red soft
django software foundationoss-projectUSOSS Librariesaka django
pypipackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://docs.djangoproject.com/en/dev/releases/security/
docs.djangoproject.com
https://groups.google.com/g/django-announce
groups.google.com
https://www.djangoproject.com/weblog/2026/mar/03/security-releases/
djangoproject.com
and 12 more references View all →

Timeline

Published
Mar 3, 2026
Last Updated
Mar 5, 2026

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