Update dependency werkzeug to v3.1.6 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
werkzeug (changelog)	==3.1.5 → ==3.1.6

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Werkzeug safe_join() allows Windows special device names

CVE-2026-27199 / GHSA-29vq-49wr-vm6x

More information

Details

Werkzeug's safe_join function allows Windows device names as filenames if when 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.

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.

Severity

• CVSS Score: 6.3 / 10 (Medium)
• Vector String: 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

References

• https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x
• https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d
• https://github.com/pallets/werkzeug/releases/tag/3.1.6
• https://nvd.nist.gov/vuln/detail/CVE-2026-27199
• https://github.com/advisories/GHSA-29vq-49wr-vm6x

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

pallets/werkzeug (werkzeug)

v3.1.6

Compare Source

Released 2026-02-19

• safe_join on Windows does not allow special devices names in
  multi-segment paths. :ghsa:29vq-49wr-vm6x

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