Vulnerability advisory

GHSA-8p8v-wh79-9r56

Django vulnerable to Uncontrolled Resource Consumption

Published Mar 3, 2026Updated Sep 10, 2026OSV record ↗

Also known as BIT-django-2026-25673CVE-2026-25673PYSEC-2026-2448

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected versions

django PyPI

All django advisories →

Affected	Fixed in
`6.0` to before 6.0.3	`6.0.3`Advisories →
Also listed as affected (3) `6.0` `6.0.1` `6.0.2`
`5.2` to before 5.2.12	`5.2.12`Advisories →
Also listed as affected (12) `5.2` `5.2.1` `5.2.10` `5.2.11` `5.2.2` `5.2.3` `5.2.4` `5.2.5` `5.2.6` `5.2.7` `5.2.8` `5.2.9`
`4.2` to before 4.2.29	`4.2.29`Advisories →
Also listed as affected (29) `4.2` `4.2.1` `4.2.10` `4.2.11` `4.2.12` `4.2.13` `4.2.14` `4.2.15` `4.2.16` `4.2.17` `4.2.18` `4.2.19` `4.2.2` `4.2.20` `4.2.21` `4.2.22` `4.2.23` `4.2.24` `4.2.25` `4.2.26` `4.2.27` `4.2.28` `4.2.3` `4.2.4` `4.2.5` `4.2.6` `4.2.7` `4.2.8` `4.2.9`

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.

GHSA-8p8v-wh79-9r56

Affected versions

django PyPI

Description

References