[SECURITY] Update dependency Werkzeug to v3.1.6

[specmatic-builder]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Werkzeug (changelog)	>=3.1.4 → >=3.1.6
Werkzeug (changelog)	==3.1.4 → ==3.1.6

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Werkzeug safe_join() allows Windows special device names with compound extensions

CVE-2026-21860 / GHSA-87hc-h4r5-73f7

More information

Details

Werkzeug's safe_join function allows path segments with Windows device names that have file extensions or trailing spaces. On Windows, there are special device names such as CON, AUX, etc that are implicitly present and readable in every directory. Windows still accepts them with any file extension, such as CON.txt, or trailing spaces such as CON .

This was previously reported as GHSA-hgf8-39gv-g3f2, but the fix failed to account for compound extensions such as CON.txt.html or trailing spaces. It also missed some additional special names.

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-87hc-h4r5-73f7
• https://nvd.nist.gov/vuln/detail/CVE-2026-21860
• https://github.com/pallets/werkzeug/commit/7ae1d254e04a0c33e241ac1cca4783ce6c875ca3
• https://github.com/pallets/werkzeug

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

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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://nvd.nist.gov/vuln/detail/CVE-2026-27199
• https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d
• https://github.com/pallets/werkzeug
• https://github.com/pallets/werkzeug/releases/tag/3.1.6

This data is provided by OSV and 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
• Response.make_conditional sets the Accept-Ranges header even if it
  is not a satisfiable range request. :issue:3108

v3.1.5

Compare Source

Released 2026-01-08

• safe_join on Windows does not allow more special device names, regardless
  of extension or surrounding spaces. :ghsa:87hc-h4r5-73f7
• The multipart form parser handles a \r\n sequence at a chunk boundary.
  This fixes the previous attempt, which caused incorrect content lengths.
  :issue:3065 :issue:3077
• Fix AttributeError when initializing DebuggedApplication with
  pin_security=False. :issue:3075

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