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Vulnerability advisory

BIT-django-2026-25673

Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows

Published Updated OSV record ↗

Also known as CVE-2026-25673GHSA-8p8v-wh79-9r56PYSEC-2026-2448

Severity

Severity not reported.

Affected versions

django Bitnami

AffectedFixed in
4.2.0 to before 4.2.294.2.29
5.2.0 to before 5.2.125.2.12
6.0.0 to before 6.0.36.0.3

Severity for this package

  • CVSS 3.xCVSS: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.

References

  • Codex
  • Claude Code
  • VS Code
  • GitHub Copilot
  • Cursor
  • Cline
  • Windsurf
  • Google Anti-gravity
  • OpenCode
  • Pi
  • Gemini CLI
  • Hermes Agent
  • Zed
  • Junie
  • Qwen Code
  • Kiro
  • Kilo Code
  • Factory Droid

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