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PYSEC-2026-2045

Werkzeug safe_join not safe on Windows

Quick fix

PYSEC-2026-2045 — werkzeug: upgrade to the fixed version with the command below.

pip install --upgrade 'werkzeug>=3.0.6'

Details

On Python < 3.11 on Windows, `os.path.isabs()` does not catch UNC paths like `//server/share`. Werkzeug's `safe_join()` relies on this check, and so can produce a path that is not safe, potentially allowing unintended access to data. Applications using Python >= 3.11, or not using Windows, are not vulnerable.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/werkzeug

Introduced in: 0Fixed in: 3.0.6

Fixpip install --upgrade 'werkzeug>=3.0.6'

References

https://github.com/pallets/werkzeug/security/advisories/GHSA-f9vj-2wh5-fj8j[WEB]
https://nvd.nist.gov/vuln/detail/CVE-2024-49766[ADVISORY]
https://github.com/pallets/werkzeug/commit/2767bcb10a7dd1c297d812cc5e6d11a474c1f092[FIX]
https://github.com/pallets/werkzeug[PACKAGE]
https://github.com/pallets/werkzeug/releases/tag/3.0.6[WEB]
https://security.netapp.com/advisory/ntap-20250131-0005[WEB]
https://pypi.org/project/werkzeug[PACKAGE]
https://github.com/advisories/GHSA-f9vj-2wh5-fj8j[ADVISORY]