PT-2026-29812 · Rack · Rack

Th4S1S · Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-34785

NVD

CVSS v3.1

7.5

High

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Static determines whether a request should be served as a static file using a simple string prefix check. When configured with URL prefixes such as "/css", it matches any request path that begins with that string, including unrelated paths such as "/css-config.env" or "/css-backup.sql". As a result, files under the static root whose names merely share the configured prefix may be served unintentionally, leading to information disclosure. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

Fix

Information Disclosure

Weakness Enumeration

CWE-200

CWE-187

Related Identifiers

CVE-2026-34785

Affected Products

Rack

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-34785 · Security Note
• https://github.com/rack/rack/security/advisories/GHSA-h2jq-g4cq-5ppq · Note