CVE-2026-4631: Red Hat Enterprise Linux 10

Critical severity, CVSS 9.8. EPSS: 9.2% chance of exploitation in the next 30 days.

Cockpit's remote login feature passes user-supplied hostnames and usernames from the web interface to the SSH client without validation or sanitization. An attacker with network access to the Cockpit web service can craft a single HTTP request to the login endpoint that injects malicious SSH options or shell commands, achieving code execution on the Cockpit host without valid credentials. The injection occurs during the authentication flow before any credential verification takes place, meaning no login is required to exploit the vulnerability.

Affected products

• Red Hat Red Hat Enterprise Linux 10: before 0:344-3.el10_1 (fixed in 0:344-3.el10_1)
• Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support: before 0:334.1-3.el10_0 (fixed in 0:334.1-3.el10_0)
• Red Hat Red Hat Enterprise Linux 7
• Red Hat Red Hat Enterprise Linux 8
• Red Hat Red Hat Enterprise Linux 9: before 0:344-2.el9_7 (fixed in 0:344-2.el9_7)
• Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support: before 0:334.2-2.el9_6 (fixed in 0:334.2-2.el9_6)

Published 2026-04-07. Last modified 2026-08-04.