Cross-site Scripting (XSS) The advisory has been revoked - it doesn't affect any version of package rubygem-rack (opens in a new tab)
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-RHEL10-RUBYGEMRACK-17973571
- published15 Jul 2026
- disclosed18 Feb 2026
Introduced: 18 Feb 2026
CVE-2026-25500 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rubygem-rack package and not the rubygem-rack package as distributed by RHEL.
Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, Rack::Directory generates an HTML directory index where each file entry is rendered as a clickable link. If a file exists on disk whose basename starts with the javascript: scheme (e.g. javascript:alert(1)), the generated index contains an anchor whose href is exactly javascript:alert(1). Clicking the entry executes JavaScript in the browser (demonstrated with alert(1)). Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.