CVE-2026-26962 (Medium) detected in rack-3.2.5.gem

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## CVE-2026-26962 - 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 version 3.2.0 to before version 3.2.6, Rack::Multipart::Parser unfolds folded multipart part headers incorrectly. When a multipart header contains an obs-fold sequence, Rack preserves the embedded CRLF in parsed parameter values such as filename or name instead of removing the folded line break during unfolding. As a result, applications that later reuse those parsed values in HTTP response headers may be vulnerable to downstream header injection or response splitting. This issue has been patched in version 3.2.6.

Publish Date: 2026-04-02

URL: CVE-2026-26962

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-rx22-g9mx-qrhv

Release Date: 2026-04-02

Fix Resolution: rack - 3.2.6

***
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Start with Gemfile.lock and the cached dependency at vendor/cache/rack-3.2.5.gem. Check how this repository updates Ruby dependencies, then upgrade rack from 3.2.5 to 3.2.6. Done means both dependency references are updated and the CVE is no longer reported.

Written by the indexing model from the issue text.