CVE-2026-32762 (Medium) detected in rack-3.2.5.gem

## CVE-2026-32762 - Medium Severity Vulnerability
Vulnerable Library - rack-3.2.5.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-3.2.5.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /vendor/cache/rack-3.2.5.gem

Dependency Hierarchy:
- manageiq-style-1.6.0.gem (Root Library)
- :x: **rack-3.2.5.gem** (Vulnerable Library)

Found in base branch: master

Vulnerability Details

Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21 and 3.2.0 to before 3.2.6, Rack::Utils.forwarded_values parses the RFC 7239 Forwarded header by splitting on semicolons before handling quoted-string values. Because quoted values may legally contain semicolons, a header can be interpreted by Rack as multiple Forwarded directives rather than as a single quoted for value. In deployments where an upstream proxy, WAF, or intermediary validates or preserves quoted Forwarded values differently, this discrepancy can allow an attacker to smuggle host, proto, for, or by parameters through a single header value. This issue has been patched in versions 3.1.21 and 3.2.6.

Publish Date: 2026-04-02

URL: CVE-2026-32762

CVSS 3 Score Details (4.8)

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://github.com/advisories/GHSA-qfgr-crr9-7r49

Release Date: 2026-04-02

Fix Resolution: rack - 3.2.6,rack - 3.1.21

***
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Start with /Gemfile.lock and the cached dependency at /vendor/cache/rack-3.2.5.gem. Update Rack to a fixed release, 3.2.6 or 3.1.21, then run the project's dependency and security checks. Done means the vulnerable Rack version is no longer present in the lockfile or vendor cache.

Written by the indexing model from the issue text.