build(deps): bump rack from 3.2.1 to 3.2.6

[dependabot]

Bumps rack from 3.2.1 to 3.2.6.

Release notes

Sourced from rack's releases.

v3.2.6

Full Changelog: rack/rack@v3.2.5...v3.2.6

v3.2.4

No release notes provided.

Changelog

Sourced from rack's changelog.

[3.2.6] - 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-2026-32762 Forwarded header semicolon injection enables Host and Scheme spoofing.
• 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-2026-34835 Rack::Request accepts invalid Host characters, enabling host allowlist bypass.
• 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.
• CVE-2026-34827 Multipart header parsing allows denial of service via escape-heavy quoted parameters.
• CVE-2026-26962 Improper unfolding of folded multipart headers preserves CRLF in parsed parameter values.

[3.2.5] - 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.

Fixed

• Fix Rack::MockResponse#body when the body is a Proc. (#2420, #2423, @​tavianator, [@​ioquatix])

[3.2.4] - 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)

[3.2.3] - 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.

[3.2.2] - 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)

Commits

• e1f22fd Bump patch version.
• 31989fd Fix typo in test.
• d268165 Fix test expectation.
• 8f425de Add Ruby v4.0 to the test matrix.
• bf83042 Drop EOL Rubies from external tests.
• d50c4d3 Implement OBS unfolding for multipart requests per RFC 5322 2.2.3
• bfb6914 Limit the number of quoted escapes during multipart parsing
• b3e5945 Add Content-Length size check in Rack::Multipart::Parser
• 7a8f326 Fix root prefix bug in Rack::Static
• a57bc14 Only do a simple substitution on the x-accel-mapping paths
• Additional commits viewable in compare view

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[github-actions]

@dependabot merge

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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_{TIP This summary will be updated as you push new changes.}

[codacy-production]

Pull Request Overview

This PR addresses multiple security vulnerabilities by upgrading Rack to version 3.2.6. Codacy analysis indicates the update successfully resolves 20 fixed issues and is up to standards. However, the implementation lacks explicit validation of the core logic affected by the security patches. There is no evidence of regression testing for multipart request parsing or general application routing, which is necessary to ensure the security fixes do not break existing request handling.

About this PR

• The PR is missing explicit verification for the addressed CVEs. It is recommended to run the full regression suite and specifically validate multipart request parsing to confirm that the security changes have not introduced breaking behavior in request handling.

Test suggestions

• Verify application stability and core routing using Rack 3.2.6 via regression suite.
• Validate multipart request parsing to ensure resolution of CVEs related to memory exhaustion and header folding.

Prompt proposal for missing tests

Consider implementing these tests if applicable:
1. Verify application stability and core routing using Rack 3.2.6 via regression suite.
2. Validate multipart request parsing to ensure resolution of CVEs related to memory exhaustion and header folding.

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