VULNERABILITY INTELLIGENCE

CVE-2026-25673

CVSS score7.5 HIGH
EPSS probability0.84%
CISA KEVNot currently listed
Published2026-03-03
Last modified2026-07-15
CVSS vectorCVSS: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.

Weakness classification

  • 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92: CWE-400
  • nvd@nist.gov: CWE-770
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-770

Primary references