CVE-2025-27111 — CRLF Injection in Rack

CWE-93 — CRLF InjectionCWE-117 — Improper Output Neutralization for Logs10 documents6 sources
Severity
6.9MEDIUMNVD
OSV5.7
EPSS
0.7%
top 28.70%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
RackDebian Ruby-rack
Timeline
PublishedMar 4
Latest updateJul 23

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.

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Affected Packages4 packages

▶debiandebian/ruby-rack< ruby-rack 2.2.13-1~deb12u1 (bookworm)
▶NVDrack/rack3.0.0 — 3.0.13+2
▶RubyGemsrack/rack3.0 — 3.0.13+2
▶CVEListV5rack/rack>= 3.0, < 3.0.13, >= 3.1, < 3.1.11+1

Patches

Patch: github.com ↗Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

5
OSV
ruby-rack vulnerabilities↗2025-07-23
▶
OSV
ruby-rack vulnerabilities↗2025-03-24
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GHSA
Escape Sequence Injection vulnerability in Rack lead to Possible Log Injection↗2025-03-04
▶
OSV
Escape Sequence Injection vulnerability in Rack lead to Possible Log Injection↗2025-03-04
▶
OSV
CVE-2025-27111: Rack is a modular Ruby web server interface↗2025-03-04
▶

📋Vendor Advisories

4
Ubuntu
Rack vulnerabilities↗2025-07-23
▶
Ubuntu
Rack vulnerabilities↗2025-03-24
▶
Red Hat
rack: rubygem-rack: Escape Sequence Injection vulnerability in Rack lead to Possible Log Injection↗2025-03-04
▶
Debian
CVE-2025-27111: ruby-rack - Rack is a modular Ruby web server interface. The Rack::Sendfile middleware logs ...↗2025
▶