CVE-2026-34785
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| rack | rack | < 2.2.23 | affected |
| rack | rack | >= 3.0.0.beta1, < 3.1.21 | affected |
| rack | rack | >= 3.2.0, < 3.2.6 | affected |
Weaknesses
- CWE-187: CWE-187: Partial String Comparison
- CWE-200: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
github.com/rack/rack: Rack: Information disclosure via incorrect static file serving prefix check
Additional References
- https://access.redhat.com/security/cve/CVE-2026-34785
- https://bugzilla.redhat.com/show_bug.cgi?id=2454486
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34785.json
References
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