CVE-2026-25673
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Django
PublishedMar 3, 2026
First seenMar 3, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- djangoproject django4.2.29, 5.2.12, 6.0.3 or later
- django6.0.3, 5.2.12, 4.2.29 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| djangoproject django | 4.2.0 ≤ v < 4.2.29, 5.2 ≤ v < 5.2.12, 6.0 ≤ v < 6.0.3 | 4.2.29, 5.2.12, 6.0.3 |
| djangoPyPI | 6.0 ≤ v < 6.0.3, 5.2 ≤ v < 5.2.12, 4.2 ≤ v < 4.2.29 | 6.0.3, 5.2.12, 4.2.29 |
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