Is this vulnerability remotely exploitable?

Yes. If an application exposes `Rack::Static` to the internet and the static root contains unintended files whose names begin with configured prefixes, an external attacker with network access can request those paths and potentially retrieve sensitive content.

Does exploitation require authentication or special privileges?

Not inherently. The vulnerability stems from how static paths are matched, which typically occurs before any application-level authentication logic. If the impacted static endpoints are publicly reachable, no credentials or special privileges are required.

What is the safest general fix pattern?

The most robust pattern is to adopt

Severity:

HIGH RISK

(7.5)

Improper Prefix Matching (CWE-187) Causing Information Disclosure (CWE-200) in Rack::Static

CVE-2026-34785

Published:

Apr 2, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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HIGH RISK

HIGH

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Remote Code Execution by Authenticated Users

May 10, 2026

Vulnerability Type

Category:

Improper Input Validation / Path Matching

CWE:

CWE-187;CWE-200

Impact:

Information Disclosure via Unintended Static File Exposure

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Input Validation / Path Matching

CWE:

CWE-187;CWE-200

Impact:

Information Disclosure via Unintended Static File Exposure

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Improper Prefix Matching (CWE-187) Causing Information Disclosure (CWE-200) in Rack::Static

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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