CVE-2025-25184

Rack provides an interface for developing web applications in Ruby. Prior to versions 2.2.11, 3.0.12, and 3.1.10, Rack::CommonLogger can be exploited by crafting input that includes newline characters to manipulate log entries. The supplied proof-of-concept demonstrates injecting malicious content into logs. When a user provides the authorization credentials via Rack::Auth::Basic, if success, the username will be put in env['REMOTE_USER'] and later be used by Rack::CommonLogger for logging purposes. The issue occurs when a server intentionally or unintentionally allows a user creation with the username contain CRLF and white space characters, or the server just want to log every login attempts. If an attacker enters a username with CRLF character, the logger will log the malicious username with CRLF characters into the logfile. Attackers can break log formats or insert fraudulent entries, potentially obscuring real activity or injecting malicious data into log files. Versions 2.2.11, 3.0.12, and 3.1.10 contain a fix.

Affected products

Debian, Linuxmint, Rack, Red Hat, Red Os, Suse, Ubuntu

Rack

< 2.2.11, 3.0.12, 3.1.10

Fix

Available

CVSS 4.0

7.1 HIGH

CVSS 3.1

6.5 MEDIUM

EPSS

1.1% (64th percentile)

Weakness

CWE-117, CWE-93

NVD status

Modified

Published

2025-02-12

No exploit for CVE-2025-25184 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.