CVE-2026-4631

Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection

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

Red Hat · Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 10.0 Extended Update Support · Red Hat Enterprise Linux 9 · Red Hat Enterprise Linux 9.6 Extended Update Support

CVSS v3.1 CNA

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

9.22% chance of exploitation in the next 30 days, 95th percentile

Nuclei

critical · CWE-78

Published

2026-04-07

Updated

2026-10-15

Proof-of-concept exploits (2)

• cyberheartmi9/CVE-2026-4631-cockpit-RCE15★ · 2026-04-18
• ExDev994/CVE-2026-4631-cockpit-RCE0★ · 2026-07-12

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-4631.yaml

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/52572

References

• CVE Record
• NVD entry

Related

• CVE-2017-12617
• CVE-2017-8295
• CVE-2026-0740
• CVE-2026-90817