Vulnerability in Rack
CVE-2026-125110
Rack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Static serves a path after Utils.clean_path_info normalization but evaluates header_rules against a path that is only URL-decoded. An unauthenticated attacker can request a known file through raw or percent-encoded dot segments and receive it without path-specific security headers such as Content-Disposition or Content-Security-Policy. Applications that do not use path-specific header_rules are not affected. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Rack — versions < 2.2.25, >= 3.0, < 3.1.23, >= 3.2, < 3.2.8
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-125110?
- CVE-2026-125110 is a medium-severity vulnerability in Rack, classified under CWE-180. CVSS score: 5.3/10. Published 2026-11-09.
- How severe is CVE-2026-125110?
- Medium severity. CVSS v3 base score is 5.3 out of 10.