Path Traversal in Rack
CVE-2026-22860
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.007 (49.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Rack — versions < 2.2.22, >= 3.0.0.beta1, < 3.1.20, >= 3.2.0, < 3.2.5
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-22860?
- CVE-2026-22860 is a high-severity vulnerability in Rack, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-02-18.
- How severe is CVE-2026-22860?
- High severity. CVSS v3 base score is 7.5 out of 10.