CVE-2026-25673

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/3/2026

Last Modified3/5/2026

Sourcenvd

Honeypot Sightings0

Affected Products

djangoproject:django

Weaknesses (CWE)

CWE-400CWE-770

References

https://docs.djangoproject.com/en/dev/releases/security/(6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

https://groups.google.com/g/django-announce(6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

https://www.djangoproject.com/weblog/2026/mar/03/security-releases/(6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

IOC Correlations

No correlations recorded

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