CVE-2024-49766: Werkzeug safe_join not safe on Windows

October 25, 2024

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.

References

github.com/advisories/GHSA-f9vj-2wh5-fj8j
github.com/pallets/werkzeug
github.com/pallets/werkzeug/commit/2767bcb10a7dd1c297d812cc5e6d11a474c1f092
github.com/pallets/werkzeug/security/advisories/GHSA-f9vj-2wh5-fj8j
nvd.nist.gov/vuln/detail/CVE-2024-49766

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