CVE-2026-106586 Security feature bypass in OpenSSH

Low 2.5 Published 6 Oct 2026 Updated 7 Oct 2026

Attackers can bypass the restrict keyword in authorized_keys to enable tunnel forwarding, undermining intended SSH access controls.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-106586?

CVE-2026-106586 is a low-severity vulnerability in OpenSSH, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In sshd in OpenSSH before 10.6, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not, a different vulnerability than CVE-2026-73283.

Weakness: CWE-670

Which versions are affected by CVE-2026-106586?

It affects 1 product.

Products include OpenSSH.

How do I fix CVE-2026-106586?

Upgrade to a fixed version.

Is CVE-2026-106586 being exploited?

There is no known exploitation of CVE-2026-106586 in the wild and no public exploit code.

All OpenSSH vulnerabilities

Sources

Also known as AZL-106688, BELL-CVE-2026-106586, DEBIAN-CVE-2026-106586, ECHO-72f2-8496-5834, GHSA-jrjw-pc9r-c624, UBUNTU-CVE-2026-106586.