CVE-2026-34763: medium-severity vulnerability in rack
Rack: Rack::Directory info disclosure and DoS via unescaped regex interpolation
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.3%
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Directory interpolates the configured root path directly into a regular expression when deriving the displayed directory path. If root contains regex metacharacters such as +, *, or ., the prefix stripping can fail and the generated directory listing may expose the full filesystem path in the HTML output. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
rack · rackRelated CVEs — rack
In the same product, most dangerous first.
CVE-2024-25126MEDIUMRack ReDos in content type parsing (2nd degree polynomial)EPSS 35.4%CVE-2019-16782MEDIUMPossible Information Leak / Session Hijack Vulnerability in RackEPSS 3.7%CVE-2024-26146MEDIUMPossible Denial of Service Vulnerability in Rack Header ParsingEPSS 2.0%CVE-2024-26141MEDIUMPossible DoS Vulnerability with Range Header in RackEPSS 1.6%CVE-2025-46727HIGHUnbounded-Parameter DoS in Rack::QueryParserEPSS 1.2%CVE-2025-25184MEDIUMPossible Log Injection in Rack::CommonLoggerEPSS 1.2%