VDB
CVE-2026-27199
CVE-2026-27199
PUBLISHED
CVSS 6.300000190734863 MEDIUM
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, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL. The function send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely. This issue has been fixed in version 3.1.6.
EPSS 0.54% · 43.5th percentile
Risk Scores
CVSS 4.0
6.300000190734863
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS Score
0.54%
43.5th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| palletsprojects | werkzeug | 0 |
| pallets | werkzeug | < 3.1.6 |
| PyPI | werkzeug | 0 |
Timeline
- Feb 19, 2026 CVE Published
- Feb 21, 2026 EPSS Score
- Feb 23, 2026 CVE Updated
- Feb 23, 2026 EPSS Score
- Feb 26, 2026 EPSS Score
- Feb 28, 2026 EPSS Score
- Mar 2, 2026 EPSS Score
- Mar 4, 2026 EPSS Score
- Mar 7, 2026 EPSS Score
- Mar 9, 2026 EPSS Score
- Mar 10, 2026 Security Advisory
- Mar 11, 2026 EPSS Score
References
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37451 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37445 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37460 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37449 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37450 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37466 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37468 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37444 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37461 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37459 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37446 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37465 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37448 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37447 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37463 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37452 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37462 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37464 advisory
- https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d fix
- https://github.com/pallets/werkzeug/releases/tag/3.1.6 fix
…and 36 more