build(deps): bump rack from 2.2.8.1 to 2.2.23 in /appengine/flexible/ruby31-and-earlier/rails-cloudsql-postgres

[dependabot]

Bumps rack from 2.2.8.1 to 2.2.23.

Changelog

Sourced from rack's changelog.

[2.2.23] - 2026-04-01

Security

• CVE-2026-34763 Root directory disclosure via unescaped regex interpolation in Rack::Directory.
• CVE-2026-34230 Avoid O(n^2) algorithm in Rack::Utils.select_best_encoding which could lead to denial of service.
• CVE-2026-26961 Raise error for multipart requests with multiple boundary parameters.
• CVE-2026-34786 Rack::Static header_rules bypass via URL-encoded path mismatch.
• CVE-2026-34831 Content-Length mismatch in Rack::Files error responses.
• CVE-2026-34826 Multipart byte range processing allows denial of service via excessive overlapping ranges.
• CVE-2026-34830 Rack::Sendfile header-based X-Accel-Mapping regex injection enables unauthorized X-Accel-Redirect.
• CVE-2026-34785 Rack::Static prefix matching can expose unintended files under the static root.
• CVE-2026-34829 Multipart parsing without Content-Length header allows unbounded chunked file uploads.

[2.2.22] - 2026-02-16

Security

• CVE-2026-25500 XSS injection via malicious filename in Rack::Directory.
• CVE-2026-22860 Directory traversal via root prefix bypass in Rack::Directory.

[2.2.21] - 2025-11-03

Fixed

• Multipart parser: limit MIME header size check to the unread buffer region to avoid false multipart mime part header too large errors when previously read data accumulates in the scan buffer. (#2392, @​alpaca-tc, @​willnet, @​krororo)

[2.2.20] - 2025-10-10

Security

• CVE-2025-61780 Improper handling of headers in Rack::Sendfile may allow proxy bypass.
• CVE-2025-61919 Unbounded read in Rack::Request form parsing can lead to memory exhaustion.

[2.2.19] - 2025-10-07

Security

• CVE-2025-61772 Multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)
• CVE-2025-61771 Multipart parser buffers large non‑file fields entirely in memory, enabling DoS (memory exhaustion)
• CVE-2025-61770 Unbounded multipart preamble buffering enables DoS (memory exhaustion)

[2.2.18] - 2025-09-25

Security

• CVE-2025-59830 Unbounded parameter parsing in Rack::QueryParser can lead to memory exhaustion via semicolon-separated parameters.

[2.2.17] - 2025-06-03

... (truncated)

Commits

• f2af0c8 Bump patch version.
• 345b744 Fix tests for old Rubies.
• e2d8e30 Add version guard around non-default gems.
• add1a80 Fix handling of Errno::EPIPE in multipart tests.
• 54261ec Fix typo in test.
• a36f48b Add ostruct to Gemfile.
• 8883f0d Fix test expectation.
• 2287a3b Add logger to gemfile.
• e6540e5 Add Ruby v4.0 to the test matrix.
• c42e357 Add Content-Length size check in Rack::Multipart::Parser
• Additional commits viewable in compare view

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