CVE-2026-34763

MEDIUM5.3EPSS 0.04%

Rack has a root directory disclosure via unescaped regex interpolation in Rack::Directory

Published: 4/2/2026Modified: 4/28/2026

Also known as:GHSA-7mqq-6cf9-v2qpCGA-4r87-7f3w-2442DEBIAN-CVE-2026-34763

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.

Affected packages (2)

Debian/ruby-rackfrom 0
RubyGems/rackfrom 0, < 2.2.23

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References (5)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-34763
ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-34763
PATCHhttps://github.com/rack/rack
WEBhttps://github.com/rack/rack/security/advisories/GHSA-7mqq-6cf9-v2qp
WEBhttps://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2026-34763.yml