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[USN-9053-1] NetworkManager-ssh vulnerability

Posted on 12 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-9053-1
November 11, 2026

network-manager-ssh vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

NetworkManager-ssh could be made to run programs as an administrator.

Software Description:
- network-manager-ssh: SSH VPN plugin for NetworkManager

Details:

It was discovered that NetworkManager-ssh did not properly validate extra
options in VPN connection settings. A local attacker could possibly use
this issue to escalate privileges.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS
network-manager-ssh 1.2.6-1ubuntu0.1~esm1
Available with Ubuntu Pro
network-manager-ssh-gnome 1.2.6-1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-9053-1
CVE-2020-9355

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