PYSEC-2026-2448
Django vulnerable to Uncontrolled Resource Consumption
At a glance
- Published
- Updated
- CVE
- CVE-2026-25673
- Aliases
- BIT-django-2026-25673, GHSA-8p8v-wh79-9r56
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 packages
| Package | Versions |
|---|---|
| PyPI · django | introduced 4.2, fixed 4.2.29, introduced 5.2, fixed 5.2.12, introduced 6.0, fixed 6.0.3 |
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
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |