Ubuntu USN · USN-8577-1

OpenSSH vulnerability

Published: Tue, 21 Jul 2026 12:17

CVE-2026-35414

Summary

OpenSSH could allow unintended access to network services.

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)

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu xenial

openssh→1:7.2p2-4ubuntu2.10+esm9apt_upgrade
Standard apt upgrade. Install 1:7.2p2-4ubuntu2.10+esm9 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y openssh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
openssh-client→1:7.2p2-4ubuntu2.10+esm9apt_upgrade
Standard apt upgrade. Install 1:7.2p2-4ubuntu2.10+esm9 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y openssh-client
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
openssh-client-ssh1→1:7.2p2-4ubuntu2.10+esm9apt_upgrade
Standard apt upgrade. Install 1:7.2p2-4ubuntu2.10+esm9 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y openssh-client-ssh1
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
openssh-server→1:7.2p2-4ubuntu2.10+esm9apt_upgrade
Standard apt upgrade. Install 1:7.2p2-4ubuntu2.10+esm9 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y openssh-server
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
openssh-sftp-server→1:7.2p2-4ubuntu2.10+esm9apt_upgrade
Standard apt upgrade. Install 1:7.2p2-4ubuntu2.10+esm9 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y openssh-sftp-server
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
ssh→1:7.2p2-4ubuntu2.10+esm9apt_upgrade
Standard apt upgrade. Install 1:7.2p2-4ubuntu2.10+esm9 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ssh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
ssh-askpass-gnome→1:7.2p2-4ubuntu2.10+esm9apt_upgrade
Standard apt upgrade. Install 1:7.2p2-4ubuntu2.10+esm9 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ssh-askpass-gnome
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
ssh-krb5→1:7.2p2-4ubuntu2.10+esm9apt_upgrade
Standard apt upgrade. Install 1:7.2p2-4ubuntu2.10+esm9 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y ssh-krb5
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Are YOU affected by USN-8577-1?

5-second check on your actual server. Reads /etc/os-release, uname -r, and dpkg-query; matches against the live USN + Debian Security Tracker feeds; tells you whether USN-8577-1 (and any other live CVE) applies. Anonymous, no signup.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan Read the bash source first

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