CVE-2026-34763

MEDIUM

Rack: Rack::Directory info disclosure and DoS via unescaped regex interpolation

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v3 5.3
EPSS 0.0004
EPSS Percentile 12.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-625
Status published
Products (6)
rack/rack < 2.2.23 (2 CPE variants)
rack/rack >= 3.0.0.beta1, < 3.1.21
rack/rack >= 3.2.0, < 3.2.6
rubygems/rack 0 - 2.2.23RubyGems
rubygems/rack 3.0.0.beta1 - 3.1.21RubyGems
rubygems/rack 3.2.0 - 3.2.6RubyGems
Published Apr 02, 2026
Tracked Since Apr 02, 2026