========================================================================== Ubuntu Security Notice USN-8577-1 July 21, 2026
openssh vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary:
OpenSSH could allow unintended access to network services.
Software Description:
- openssh: secure shell (SSH) for secure access to remote machines
Details:
USN-8222-1 fixed a vulnerability in OpenSSH. This update provides the
corresponding fix for Ubuntu 16.04 LTS.
Original advisory details:
Vladimir Tokarev discovered that OpenSSH incorrectly handled certificates
with the principal name containing a comma character when using user-trusted
CA keys in authorized_keys and an authorized_keys principals="" option
that lists more than one principal. This could result in inappropriate
principal matching, contrary to expectations. (CVE-2026-35414)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS
openssh-server 1:7.2p2-4ubuntu2.10+esm9
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8577-1
CVE-2026-35414
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