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Vulnerability record · CVE-2026-25673 · published 3 March 2026

CVE-2026-25673: Djangoproject django uncontrolled resource consumption vulnerability

Djangoproject · Django

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.

7.5 CVSS 3.1 High EPSS 1.1% · top 35.7% CWE-400 · Uncontrolled resource consumptionCWE-770 · Allocation without limits
7.5CVSS 3.1 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
15 Jul 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.djangoproject.com/en/dev/releases/security/ PatchVendor Advisory
https://groups.google.com/g/django-announce Release Notes
https://www.djangoproject.com/weblog/2026/mar/03/security-releases/ PatchVendor Advisory
https://access.redhat.com/security/cve/CVE-2026-25673
https://bugzilla.redhat.com/show_bug.cgi?id=2444115
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25673.json

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Source: NIST National Vulnerability Database (record CVE-2026-25673), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.