CVEvulnerability
CVE-2026-25673
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2026-03-03
- Last modified
- 2026-07-15
- Assigner
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400, CWE-770
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.
Affected configurations
• djangoproject django (>= 4.2.0 < 4.2.29)
• djangoproject django (>= 5.2 < 5.2.12)
• djangoproject django (>= 6.0 < 6.0.3)
Related
References
- https://docs.djangoproject.com/en/dev/releases/security/ Patch, Vendor Advisory
- https://groups.google.com/g/django-announce Release Notes
- https://www.djangoproject.com/weblog/2026/mar/03/security-releases/ Patch, Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-25673 access.redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2444115 bugzilla.redhat.com
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25673.json security.access.redhat.com