CVE-2025-27111

Escape Sequence Injection vulnerability in Rack lead to Possible Log Injection

Description

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.

Category

6.9
CVSS
Severity: Medium
CVSS 4.0 •
EPSS 0.30%
Affected: rack rack
Published at:
Updated at:

References

Link Tags
https://github.com/rack/rack/security/advisories/GHSA-8cgq-6mh2-7j6v
https://github.com/rack/rack/commit/803aa221e8302719715e224f4476e438f2531a53
https://github.com/rack/rack/commit/aeac570bb8080ca7b53b7f2e2f67498be7ebd30b
https://github.com/rack/rack/commit/b13bc6bfc7506aca3478dc5ac1c2ec6fc53f82a3

Frequently Asked Questions

What is the severity of CVE-2025-27111?
CVE-2025-27111 has been scored as a medium severity vulnerability.
How to fix CVE-2025-27111?
To fix CVE-2025-27111, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-27111 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-27111 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-27111?
CVE-2025-27111 affects rack rack.
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