Rack up to 2.2.11/3.0.12/3.1.10 Header Rack::Sendfile X-Sendfile-Type crlf injection

Summaryinfo

A vulnerability described as problematic has been identified in Rack up to 2.2.11/3.0.12/3.1.10. This affects the function Rack::Sendfile of the component Header Handler. The manipulation of the argument X-Sendfile-Type results in crlf injection. This vulnerability was named CVE-2025-27111. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in Rack up to 2.2.11/3.0.12/3.1.10. Affected is the function Rack::Sendfile of the component Header Handler. The manipulation of the argument X-Sendfile-Type with an unknown input leads to a crlf injection vulnerability. CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-27111 since 02/18/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 232155 (Linux Distros Unpatched Vulnerability : CVE-2025-27111), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.2.12, 3.0.13 or 3.1.11 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (232155). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Rack

Version

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.7
• 2.2.8
• 2.2.9
• 2.2.10
• 2.2.11
• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7
• 3.0.8
• 3.0.9
• 3.0.10
• 3.0.11
• 3.0.12
• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 3.1.9
• 3.1.10

Website

• Product: https://github.com/rack/rack/

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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