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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-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.

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)

Changed

• Raise before exceeding a part limit, not after. (#2362, @​matthew-puku)
• Rack::Deflater now uses a fixed GZip mtime value. (#2372, @​bensheldon)

[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)

[3.2.1] -- 2025-09-02

Added

• Add support for streaming bodies when using Rack::Events. (#2375, @​unflxw)

Fixed

• Fix an issue where a NoMethodError would be raised when using Rack::Events with streaming bodies. (#2375, @​unflxw)

[3.2.0] - 2025-07-31

This release continues Rack's evolution toward a cleaner, more efficient foundation while maintaining backward compatibility for most applications. The breaking changes primarily affect deprecated functionality, so most users should experience a smooth upgrade with improved performance and standards compliance.

SPEC Changes

... (truncated)

• 6ef5915 Bump patch version.
• 4e2c903 Unbounded read in Rack::Request form parsing can lead to memory exhaustion.
• fba2c8b Improper handling of proxy headers in Rack::Sendfile may allow proxy bypass.
• ed3d834 Normalize adivsories links.
• 4c4ea29 Bump patch version.
• c370dcd Limit amount of retained data when parsing multipart requests
• d869fed Fix denial of service vulnerbilties in multipart parsing
• 0f76d43 Bump patch version.
• 493a411 Fix thin integration.
• 54e4ffd Unbounded parameter parsing in Rack::QueryParser.
• Additional commits viewable in compare view

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