Update dependency Werkzeug to v3.1.9 [SECURITY]

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
Werkzeug (changelog)	==3.1.8 → ==3.1.9

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Werkzeug safe_join() allows Windows special device names

CVE-2026-102598 / GHSA-g6x2-hccm-hh4m

More information

Details

Werkzeug's safe_join function allows Windows device names as filenames when they have an empty ADS marker on NTFS.

This was previously reported as GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact Windows allows special device names with an empty ADS marker, such as 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 NTFS, 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-g6x2-hccm-hh4m
• https://nvd.nist.gov/vuln/detail/CVE-2026-102598
• https://github.com/pallets/werkzeug/pull/3309
• https://github.com/pallets/werkzeug/commit/8d77320bcdf3a34941ec06dcf16b03c065cd21b6
• https://github.com/pallets/werkzeug/releases/tag/3.1.9
• https://github.com/advisories/GHSA-g6x2-hccm-hh4m

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

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Release Notes

pallets/werkzeug (Werkzeug)

v3.1.9

Compare Source

Released 2026-09-27

• safe_join on Windows does not allow special devices names with empty ADS
  markers on NTFS. :ghsa:g6x2-hccm-hh4m
• ProfilerMiddleware uses profiling.tracing on Python 3.15.
  :issue:3207
• uri_to_iri and iri_to_uri preserve empty username, password, and
  port 0. :issue:3189
• Improve performance of parse_options_header. :pr:3231
• Improve performance of parse_etags. :pr:3231
• Improve performance of parse_cookie. :pr:3231
• get_host also checks that the port is in the valid range. :pr:3236
• The int URL converter returns a 404 instead of 500 error when the value
  is longer than sys.get_int_max_str_digits(). :issue:3237
• Improve debugger PIN generation from cgroup data inside Podman.
  :issue:3245
• Authorization parsing basic auth disallows non-base64 characters.
  :pr:3248
• application/x-www-form-urlencoded form data is no longer limited to
  max_form_memory_size, only max_content_length. :pr:3251
• LimitedStream.readinto does not resize the buffer when it reads less
  than the remaining size. :pr:3253
• Rules with 10 or more converters in a single part assign matched values
  correctly. :pr:3254
• The invalid Range suffix length -0 is no longer accepted. :pr:3255

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[gemini-code-assist]

Code Review

This pull request updates the Werkzeug dependency from version 3.1.8 to 3.1.9 across multiple requirements.txt files. The review feedback highlights that Python versions below 3.10 are no longer supported, and recommends removing the outdated environment marker '; python_version >= '3.9'' from several requirements files.

[gemini-code-assist]

Python versions below 3.10 are no longer supported. Please remove the environment marker ; python_version >= '3.9' as we should not specify environment markers for Python versions older than 3.10.

Werkzeug==3.1.9

References

1. Do not specify fallback dependency versions or environment markers for Python versions older than 3.10, as Python versions below 3.10 are no longer supported.

[gemini-code-assist]

Python versions below 3.10 are no longer supported. Please remove the environment marker ; python_version >= '3.9' as we should not specify environment markers for Python versions older than 3.10.

Werkzeug==3.1.9

References

1. Do not specify fallback dependency versions or environment markers for Python versions older than 3.10, as Python versions below 3.10 are no longer supported.

[gemini-code-assist]

Python versions below 3.10 are no longer supported. Please remove the environment marker ; python_version >= '3.9' as we should not specify environment markers for Python versions older than 3.10.

Werkzeug==3.1.9

References

1. Do not specify fallback dependency versions or environment markers for Python versions older than 3.10, as Python versions below 3.10 are no longer supported.