Update dependency werkzeug to v3.1.9 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
werkzeug (changelog)	3.1.6 → 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

v3.1.8

Compare Source

Released 2026-04-02

• Request.host and get_host return the empty string if the header is
  missing or has invalid characters. :issue:3142

v3.1.7

Compare Source

Released 2026-03-23

• parse_list_header preserves partially quoted items, discards empty
  items, and returns empty for unclosed quoted values. :pr:3128
• WWWAuthenticate.to_header does not produce a trailing space when there
  are no parameters. :issue:3127
• Transfer-Encoding is parsed as a set. :pr:3134
• Request.host, get_host, and host_is_trusted validate the
  characters of the value. An empty value is no longer allowed. A Unix socket
  server address is ignored. The trusted_list argument to
  host_is_trusted is optional. :pr:3113
• Fix multipart form parser handling of newline at boundary. :issue:3088
• Response.make_conditional sets the Accept-Ranges header even if it
  is not a satisfiable range request. :issue:3108
• merge_slashes merges any number of consecutive slashes. :issue:3121

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