CVE-2026-4631criticalobserved exploitationCWE-78

CVE-2026-4631: critical vulnerability in Red Hat Enterprise Linux 10

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

Published · Updated

85Vexday Risk Score

Patch now. It exploitation observed by VulnCheck and has a working public exploit.

ssvc Actcvss 9.8epss 9.2%
from disclosure to weapon11 days
Published on NVDApr 7
1st PoC+11d
VulnCheck+92d
exploitation probability
9.2%top 5% of all CVEs
observed exploitation
yesVulnCheck
5 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Red Hat · Red Hat Enterprise Linux 10Red Hat · Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat · Red Hat Enterprise Linux 7Red Hat · Red Hat Enterprise Linux 8Red Hat · Red Hat Enterprise Linux 9Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support
public PoCs found — 5
exploitdbwww.exploit-db.com/exploits/52572unverifiedgithubgithub.com/cyberheartmi9/CVE-2026-4631-cockpit-RCE★ 14githubgithub.com/ExDev994/CVE-2026-4631-cockpit-RCE★ 0vulncheckvulncheck.com/xdb/f977ca407281unverifiedvulncheckvulncheck.com/xdb/9de392bd75b2unverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Red Hat Enterprise Linux 10

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References
https://access.redhat.com/errata/RHSA-2026:7381https://access.redhat.com/errata/RHSA-2026:7382https://access.redhat.com/errata/RHSA-2026:7383https://access.redhat.com/errata/RHSA-2026:7384https://access.redhat.com/security/cve/CVE-2026-4631https://bugzilla.redhat.com/show_bug.cgi?id=2450246https://github.com/cockpit-project/cockpit/security/advisories/GHSA-m4gv-x78h-3427https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4631.jsonhttp://www.openwall.com/lists/oss-security/2026/04/10/5