CVE-2026-22860: Rack

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, `Rack::Directory`’s path check used a string prefix match on the expanded path. A request like `/../root_example/` can escape the configured root if the target path starts with the root string, allowing directory listing outside the intended root. Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.

Affected products

• Rack Rack: before 2.2.22 (fixed in 2.2.22); from 3.0.0, before 3.1.20 (fixed in 3.1.20); from 3.2.0, before 3.2.5 (fixed in 3.2.5)

Published 2026-02-18. Last modified 2026-07-15.