Vulnerability in Rack
CVE-2025-27111
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 hea…
Vulnerability class: CRLF Injection
EPSS: 0.007 (48.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Rack — versions < 2.2.12, >= 3.0, < 3.0.13, >= 3.1, < 3.1.11
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-27111?
- CVE-2025-27111 is a high-severity vulnerability in Rack, classified under CRLF Injection. CVSS score: 7.5/10. Published 2025-03-04.
- How severe is CVE-2025-27111?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-27111 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.