What is CVE-2026-27199?

CVE-2026-27199 is a medium-severity vulnerability in Pallets Werkzeug, classified under CWE-67. CVSS score: 5.3/10. Published 2026-02-21.

How severe is CVE-2026-27199?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Pallets Werkzeug

CVE-2026-27199

Werkzeug is a comprehensive WSGI web application library. Versions 3.1.5 and below, the safe_join function allows Windows device names as filenames if preceded by other path segments. This was previously reported as GHSA-hgf8-39gv-g3f2, bu…

EPSS: 0.006 (42.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Pallets Werkzeug — versions < 3.1.6
Palletsprojects Werkzeug

Weakness classification (CWE)

CWE-67

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-27199?: CVE-2026-27199 is a medium-severity vulnerability in Pallets Werkzeug, classified under CWE-67. CVSS score: 5.3/10. Published 2026-02-21.
How severe is CVE-2026-27199?: Medium severity. CVSS v3 base score is 5.3 out of 10.