HIGH7.5
PYSEC-2026-2448
Django vulnerable to Uncontrolled Resource Consumption
Quick fix
PYSEC-2026-2448 — django: upgrade to the fixed version with the command below.
pip install --upgrade 'django>=4.2.29'Details
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.
Are you affected?
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Affected packages
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-25673[ADVISORY]
- https://docs.djangoproject.com/en/dev/releases/security[WEB]
- https://github.com/django/django[PACKAGE]
- https://groups.google.com/g/django-announce[WEB]
- https://www.djangoproject.com/weblog/2026/mar/03/security-releases[WEB]
- https://pypi.org/project/django[PACKAGE]
- https://github.com/advisories/GHSA-8p8v-wh79-9r56[ADVISORY]