Exposure of Information Through Directory Listing Affecting rack package, versions <2.2.22>=3.0.0.beta1, <3.1.20>=3.2.0, <3.2.5
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-15307669
- published18 Feb 2026
- disclosed17 Feb 2026
- creditMasamuneee
Introduced: 17 Feb 2026
NewCVE-2026-22860 (opens in a new tab)How to fix?
Upgrade rack to version 2.2.22, 3.1.20, 3.2.5 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 Exposure of Information Through Directory Listing in Rack::Directory, which checks for presence in the root directory only by left-side string comparison. An attacker can list directories outside the intended root if the prefix of the target directory is exactly the name of the root directory. E.g. www_backup is exposed when www is intended.