CVE-2026-25673
Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | djangoproject |
| Product | django |
| Published | Mar 3, 2026 |
| Last Updated | Mar 3, 2026 |
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Affected Versions
djangoproject / Django
6.0 < 6.0.3 5.2 < 5.2.12 4.2 < 4.2.29
References
Credits
🔍 Seokchan Yoon Natalia Bidart Natalia Bidart