[dependabot]

Bumps rack from 3.1.8 to 3.1.23.

Changelog

Sourced from rack's changelog.

[3.1.23] - 2026-10-30

Security

• GHSA-5v64-555j-wjxm Multipart parser retains parsed data in its scan buffer, allowing denial of service via memory exhaustion.
• GHSA-wvg4-6p58-3gh3 Rack::Static header rules were matched against an unnormalized path, allowing dot segments to bypass them.
• GHSA-2j8w-xcrc-x985 Rack::Request#host_with_port, #base_url, and #url returned the raw authority when it was invalid; host_with_port now returns nil in that case.
• GHSA-p8x9-v4hv-2w4g Multipart requests with more than one boundary parameter were accepted when the first value was empty or began with a quote, semicolon, or comma, bypassing the guard added for CVE-2026-26961.

[3.1.22] - 2026-08-13

Security

• CVE-2026-26962 Improper unfolding of folded multipart headers preserves CRLF in parsed parameter values.

Fixed

• Restore Ruby 2.4/2.5 compatibility.

[3.1.21] - 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.

[3.1.20] - 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.

[3.1.19] - 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)

[3.1.18] - 2025-10-10

... (truncated)

Commits

• 7131b80 Bump patch version.
• 4ce7131 Update changelog.
• 19a1a19 Reject multipart content types with a boundary parameter before the parsed one.
• 4380381 Don't leak invalid Host through host_with_port.
• 9d7f194 Normalize static header rule paths before matching.
• 2eaa5b1 Remove parsed bytes from the multipart buffer while reading parts.
• 528a5e2 Bump patch version.
• ae320b4 Backport OBS unfolding for multipart requests to 3-1-stable (#2486)
• 7625c59 Fix specs on Ruby 2.4
• b325730 Do not ignore Ruby 2.4/2.5 errors in CI
• Additional commits viewable in compare view

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