CRLF injection in Rack - CVE-2026-26962
Published: April 2, 2026
Vulnerability identifier: #VU124822
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-26962
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Rack
Affected software:
Rack
Rack
Detailed vulnerability description
The vulnerability allows a remote attacker to inject arbitrary data in server response.
The vulnerability exists due to insufficient validation of attacker-supplied data within Rack::Multipart::Parser. A remote attacker can pass specially crafted data to the application containing CR-LF characters and modify application behavior.
How to mitigate CVE-2026-26962
Install updates from vendor's website.