What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-25 · updated 2026-06-17
• Weakness: CWE-22

Description

Werkzeug is a Web Server Gateway Interface web application library. 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. Werkzeug version 3.0.6 contains a patch.

Affected products

• pallets werkzeug: before 3.0.6 — fixed in 3.0.6
• Pypi Werkzeug: before 3.0.6; 0.1, 0.10, 0.10.1, 0.10.2, 0.10.3, 0.10.4 (+90) — fixed in 3.0.6

How to fix

Upgrade to a fixed version: pallets werkzeug 3.0.6; Pypi Werkzeug 3.0.6. Check the vendor advisory for mitigations.

References

• https://github.com/pallets/werkzeug/commit/2767bcb10a7dd1c297d812cc5e6d11a474c1f092
• https://github.com/pallets/werkzeug/releases/tag/3.0.6
• https://github.com/pallets/werkzeug/security/advisories/GHSA-f9vj-2wh5-fj8j
• https://security.netapp.com/advisory/ntap-20250131-0005/

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