Interpretation Conflict Affecting rack package, versions >=3.0.0.beta1, <3.1.21>=3.2.0, <3.2.6
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Test your applications- Snyk IDSNYK-RUBY-RACK-15878235
- published3 Apr 2026
- disclosed2 Apr 2026
- creditth4s1s
Introduced: 2 Apr 2026
NewCVE-2026-32762 (opens in a new tab)How to fix?
Upgrade rack to version 3.1.21, 3.2.6 or higher.
Overview
rack is 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.
Affected versions of this package are vulnerable to Interpretation Conflict in the forwarded_values component. An attacker can manipulate HTTP headers to inject semicolons into quoted values, causing the process to misinterpret a single quoted value as multiple directives. This can result in host, proto, for, or by parameters being smuggled through a single header value, potentially leading to host and scheme spoofing by sending specially crafted Forwarded headers.