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CVE-2025-27610: Local File Inclusion in Rack::Static

7.5 CVSS

Description

Rack provides an interface for developing web applications in Ruby. Prior to versions 2.2.13, 3.0.14, and 3.1.12, `Rack::Static` can serve files under the specified `root:` even if `urls:` are provided, which may expose other files under the specified `root:` unexpectedly. The vulnerability occurs because `Rack::Static` does not properly sanitize user-supplied paths before serving files. Specifically, encoded path traversal sequences are not correctly validated, allowing attackers to access files outside the designated static file directory. By exploiting this vulnerability, an attacker can gain access to all files under the specified `root:` directory, provided they are able to determine then path of the file. Versions 2.2.13, 3.0.14, and 3.1.12 contain a patch for the issue. Other mitigations include removing usage of `Rack::Static`, or ensuring that `root:` points at a directory path which only contains files which should be accessed publicly. It is likely that a CDN or similar static file server would also mitigate the issue.

Classification

CVE ID: CVE-2025-27610

CVSS Base Severity: HIGH

CVSS Base Score: 7.5

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types

CWE-23: Relative Path Traversal

Affected Products

Vendor: rack

Product: rack

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.07% (probability of being exploited)

EPSS Percentile: 18.53% (scored less or equal to compared to others)

EPSS Date: 2025-04-08 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-27610
https://github.com/rack/rack/security/advisories/GHSA-7wqh-767x-r66v
https://github.com/rack/rack/commit/50caab74fa01ee8f5dbdee7bb2782126d20c6583

Timeline