GitHub Advisoryadvisory · PyPI
GHSA-8p8v-wh79-9r56 Django vulnerable to Uncontrolled Resource Consumption
HIGH
Official page ↗
- Aliases
- CVE-2026-25673
- Ecosystem
- PyPI
- Packages
- Django
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400, CWE-770
- Reviewed
- 2026-03-04
Affected packages
• PyPI Django: >= 6.0, < 6.0.3 → fixed in 6.0.3
• PyPI Django: >= 5.2, < 5.2.12 → fixed in 5.2.12
• PyPI Django: >= 4.2, < 4.2.29 → fixed in 4.2.29
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.
Related
Alias · CVE (1)
- CVE-2026-25673 An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. vulnerability