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CVE-2025-27111

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Date: March 4, 2025

Rack is a modular Ruby web server interface. The Rack::Sendfile middleware logs unsanitised header values from the X-Sendfile-Type header. An attacker can exploit this by injecting escape sequences (such as newline characters) into the header, resulting in log injection. This vulnerability is fixed in 2.2.12, 3.0.13, and 3.1.11.

Severity Score

Related Resources (9)

https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2025-27111.yml
https://github.com/rack/rack/commit/803aa221e8302719715e224f4476e438f2531a53
https://github.com/rack/rack/commit/b13bc6bfc7506aca3478dc5ac1c2ec6fc53f82a3
https://nvd.nist.gov/vuln/detail/CVE-2025-27111
https://github.com/rack/rack/security/advisories/GHSA-8cgq-6mh2-7j6v
https://github.com/rack/rack/commit/aeac570bb8080ca7b53b7f2e2f67498be7ebd30b
https://github.com/rack/rack
https://security-tracker.debian.org/tracker/CVE-2025-27111
https://www.mend.io/vulnerability-database/CVE-2025-27111

Severity Score

Weakness Type (CWE)

Improper Neutralization of CRLF Sequences ('CRLF Injection')

CWE-93

Improper Output Neutralization for Logs

CWE-117

Top Fix

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Upgrade Version

Upgrade to version rack - 2.2.12;rack - 3.0.13;rack - 3.1.11

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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