🚨 [security] Update rack 3.1.12 → 3.1.14 (patch)

[depfu]

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🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

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Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ rack (3.1.12 → 3.1.14) · Repo · Changelog

Security Advisories 🚨

🚨 Rack has an Unbounded-Parameter DoS in Rack::QueryParser

Summary

Rack::QueryParser parses query strings and application/x-www-form-urlencoded bodies into Ruby data structures without imposing any limit on the number of parameters, allowing attackers to send requests with extremely large numbers of parameters.

Details

The vulnerability arises because Rack::QueryParser iterates over each &-separated key-value pair and adds it to a Hash without enforcing an upper bound on the total number of parameters. This allows an attacker to send a single request containing hundreds of thousands (or more) of parameters, which consumes excessive memory and CPU during parsing.

Impact

An attacker can trigger denial of service by sending specifically crafted HTTP requests, which can cause memory exhaustion or pin CPU resources, stalling or crashing the Rack server. This results in full service disruption until the affected worker is restarted.

Mitigation

• Update to a version of Rack that limits the number of parameters parsed, or
• Use middleware to enforce a maximum query string size or parameter count, or
• Employ a reverse proxy (such as Nginx) to limit request sizes and reject oversized query strings or bodies.

Limiting request body sizes and query string lengths at the web server or CDN level is an effective mitigation.

Release Notes

3.1.14 (from changelog)

Security

• CVE-2025-46727 Unbounded parameter parsing in Rack::QueryParser can lead to memory exhaustion.

3.1.13 (from changelog)

• Ensure Rack::ETag correctly updates response body. (#2324, @ioquatix)

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 4 commits:

• Bump patch version.
• Merge commit from fork
• Bump patch version.
• Ensure `Rack::ETag` correctly updates response body. (#2324)

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Closed in favor of #359.

[depfu]

Closed in favor of #359.