CVE-2026-22860 (High) detected in rack-2.2.21.gem

[mend-bolt-for-github]

CVE-2026-22860 - High Severity Vulnerability

Vulnerable Library - rack-2.2.21.gem

Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.

Library home page: https://rubygems.org/gems/rack-2.2.21.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /vendor/cache/rack-2.2.21.gem

Dependency Hierarchy:

• ❌ rack-2.2.21.gem (Vulnerable Library)

Found in HEAD commit: 99489caead4b82daad011bd2d1b5f720b8428654

Found in base branch: master

Vulnerability Details

Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, "Rack::Directory"’s path check used a string prefix match on the expanded path. A request like "/../root_example/" can escape the configured root if the target path starts with the root string, allowing directory listing outside the intended root. Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.

Publish Date: 2026-02-18

URL: CVE-2026-22860

CVSS 3 Score Details (7.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: High
  • Integrity Impact: None
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-02-17

Fix Resolution: https://github.com/rack/rack.git - v3.2.5,https://github.com/rack/rack.git - v3.1.20,https://github.com/rack/rack.git - v2.2.22

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