Improper Certificate Validation in Apache Mina SSHD - CVE-2026-56624

Vulnerability identifier: #VU144742

CSH Severity: Low

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-56624

CWE-ID: CWE-295

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to execute commands outside intended certificate restrictions.

The vulnerability exists due to improper certificate validation in server-side OpenSSH user certificate validation when processing certificate options during user authentication. A remote user can present a crafted certificate containing an unsupported force-command or verify-required option to execute commands outside intended certificate restrictions.

The specific commands available depend on the implementation of the server.

Apache Mina SSHD
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
Development Tools Module
apache-sshd

Install security update from vendor's website.

Apache Mina SSHD - addressed in versions 2.19.0, 3.0.0-M5
apache-sshd - update to 2.19.0-150200.5.16.1

• https://lists.apache.org/api/email.lua?id=o4c2jml522j3z80gbryqzc2f1253ltp6
• https://mina.apache.org/

• SUSE update for apache-sshd
• Multiple vulnerabilities in Apache Mina SSHD