CVE-2026-56624 Apache MINA SSHD: SSH certificate options lack validations
Attackers can bypass SSH certificate restrictions to execute unauthorized commands in applications using Apache MINA SSHD.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-56624?
CVE-2026-56624 is a high-severity vulnerability in Apache MINA SSHD, published on 20 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Improper certificate validation in Apache MINA SSHD (server-side). Apache MINA SSHD is a Java library for client-side and server-side SSH.
Server-side OpenSSH user certificate validation during user authentication in an Apache MINA SSHD server did not check for the unsupported force-command or verify-required options that could be embedded in the certificate, nor did it validate these options. As a result it was possible that a user could authenticate with such a certificate that included a force-command option but still was able to execute other commands. What other command exactly would be available to the user depends on the implementation of the server.
This issue is fixed in Apache MINA SSHD 2.19.0 and 3.0.0-M5. Applications are advised to upgrade to these versions.
The fix rejects OpenSSH user certificates that include these options, since Apache MINA SSHD implements neither force-command nor sk-*[email protected] user certificates (which are the only ones for which verify-required would make sense).
Weakness: CWE-295
Which versions are affected by CVE-2026-56624?
It affects 1 product.
Products include Apache Mina Sshd.
How do I fix CVE-2026-56624?
Upgrade to a fixed version.
Is CVE-2026-56624 being exploited?
There is no known exploitation of CVE-2026-56624 in the wild and no public exploit code.
Other vulnerabilities in Apache MINA SSHD
- CVE-2026-56452 Apache MINA SSHD: Path traversal in SCP file reception
- CVE-2026-56623 Apache MINA SSHD: Path traversal in org.apache.sshd:sshd-git on Windows
- CVE-2026-48827 Apache MINA SSHD: Path traversal in org.apache.sshd:sshd-git
- CVE-2024-41909 Apache MINA SSHD: integrity check bypass
- CVE-2019-6111 Path traversal in n/a
Sources
Also known as CLEANSTART-2026-BQ51036, CLEANSTART-2026-JH16561, CLEANSTART-2026-NF19276, DEBIAN-CVE-2026-56624, GHSA-j262-jh5j-p4fw, UBUNTU-CVE-2026-56624.