Race Condition Affecting rack package, versions <2.2.14
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-RACK-10074188
- published8 May 2025
- disclosed7 May 2025
- creditS. Tokarenko
Introduced: 7 May 2025
NewCVE-2025-32441 (opens in a new tab)How to fix?
Upgrade rack to version 2.2.14 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 Race Condition in Rack::Session::Pool middleware, which allows an attacker to restore and use a deleted session. The attacker must be in possession of a valid session cookie and the attack must be timed to coincide with a disconnection from the long-running session by another user.
Workaround
This vulnerability can be avoided by invalidating sessions using the logged_out flag rather than deleting them, or by enforcing session invalidation by maintaining a custom session store and invalidating based on timestamp as soon as a session is closed.
Note: This vulnerability is addressed for Rack versions 3 and above in rack-session. The vulnerability is tracked by CVE-2025-46336.