build(deps): bump rack from 3.2.5 to 3.2.6

[dependabot]

Bumps rack from 3.2.5 to 3.2.6.

Release notes

Sourced from rack's releases.

v3.2.6

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

Changelog

Sourced from rack's changelog.

Changelog

All notable changes to this project will be documented in this file. For info on how to format all future additions to this file please reference Keep A Changelog.

Unreleased

Security

• CVE-2026-34763 Root directory disclosure via unescaped regex interpolation in Rack::Directory.
• Escape non-printable characters in Rack::ShowExceptions#dump_exception output to prevent CRLF injection via exception messages containing user-controlled data. (@​haruki0409)
• 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 Quadratic-time 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.

SPEC Changes

• Define rack.response_finished callback arguments more strictly. (#2365, @​skipkayhil)

Added

• Add Rack::Files#assign_headers to allow overriding how the configured file headers are set. (#2377, @​codergeek121)
• Add support for rack.response_finished to Rack::TempfileReaper. (#2363, @​skipkayhil)
• Add support for streaming bodies when using Rack::Events. (#2375, @​unflxw)
• Add deflaters option to Rack::Deflater to enable custom compression algorithms like zstd. (#2168, @​alexanderadam)
• Add Rack::Request#prefetch? for identifying requests with Sec-Purpose: prefetch header set. (#2405, @​glaszig)
• Add rack.request.trusted_proxy environment key to indicate whether the request is coming from a trusted proxy.

Changed

• Raise before exceeding a part limit, not after. (#2362, @​matthew-puku)
• Rack::Deflater now uses a fixed GZip mtime value. (#2372, @​bensheldon)
• Multipart parser drops support for RFC 2231 filename* parameter (prohibited by RFC 7578) and now properly handles UTF-8 encoded filenames via percent-encoding and direct UTF-8 bytes. (#2398, @​wtn)
• The query parser now raises Rack::QueryParser::IncompatibleEncodingError if we try to parse params that are not ASCII compatible. (#2416, @​bquorning)

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)
• Multipart parser: add nil guards to prevent NoMethodError crashes when handling Content-Disposition without parameters and Content-Type parameters without '='. (@​haruki0409)

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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