CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2026-34785
High (7.5) in rack rack. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in rack 2.2.23, 3.1.21, 3.2.6.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 33% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-187, CWE-200, CWE-552
- Published
- Modified
- Record from
- the NVD, synced
Affected
- rack:rack
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-h2jq-g4cq-5ppq | RubyGems | rack | <2.2.23 | 2.2.23 |
| GHSA-h2jq-g4cq-5ppq | RubyGems | rack | >=3.0.0.beta1 <3.1.21 | 3.1.21 |
| GHSA-h2jq-g4cq-5ppq | RubyGems | rack | >=3.2.0 <3.2.6 | 3.2.6 |