🚨 [security] Update rack 3.1.9 → 3.1.12 (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 (indirect, 3.1.9 → 3.1.12) · Repo · Changelog

Security Advisories 🚨

🚨 Local File Inclusion in Rack::Static

Summary

Rack::Static can serve files under the specified root: even if urls: are provided, which may expose other files under the specified root: unexpectedly.

Details

The vulnerability occurs because Rack::Static does not properly sanitize user-supplied paths before serving files. Specifically, encoded path traversal sequences are not correctly validated, allowing attackers to access files outside the designated static file directory.

Impact

By exploiting this vulnerability, an attacker can gain access to all files under the specified root: directory, provided they are able to determine then path of the file.

Mitigation

• Update to the latest version of Rack, or
• Remove usage of Rack::Static, or
• Ensure that root: points at a directory path which only contains files which should be accessed publicly.

It is likely that a CDN or similar static file server would also mitigate the issue.

🚨 Escape Sequence Injection vulnerability in Rack lead to Possible Log Injection

Summary

Rack::Sendfile can be exploited by crafting input that includes newline characters to manipulate log entries.

Details

The Rack::Sendfile middleware logs unsanitized header values from the X-Sendfile-Type header. An attacker can exploit this by injecting escape sequences (such as newline characters) into the header, resulting in log injection.

Impact

This vulnerability can distort log files, obscure attack traces, and complicate security auditing.

Mitigation

• Update to the latest version of Rack, or
• Remove usage of Rack::Sendfile.

Release Notes

3.1.11 (from changelog)

Security

• CVE-2025-27111 Possible Log Injection in Rack::Sendfile.

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

Commits

See the full diff on Github. The new version differs by 7 commits:

• Bump patch version.
• Update changelog.
• Use a fully resolved file path when confirming if a file can be served by `Rack::Static`.
• Bump patch version.
• Use `#inspect` to prevent log injection.
• Bump patch version.
• Escape non-printable characters when logging.

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[coveralls]

coverage: 99.07%. remained the same
when pulling 73713c4 on depfu/update/rack-3.1.12
into abcbd89 on main.

[depfu]

Closing because this update has already been applied