CVE-2026-106553 Auth bypass in OpenSSH

Low 2.2 Published 6 Oct 2026 Updated 7 Oct 2026

Attackers may retain credentials after failed GSSAPI authentication, potentially bypassing security controls in OpenSSH.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2026-106553?

CVE-2026-106553 is a low-severity authentication bypass vulnerability in OpenSSH, published on 6 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

In sshd in OpenSSH before 10.6, credentials can incorrectly persist after failure of a GSSAPIAuthentication authentication attempt.

Weakness: CWE-669

Which versions are affected by CVE-2026-106553?

It affects 1 product.

Products include OpenSSH.

How do I fix CVE-2026-106553?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-106553 being exploited?

There is no known exploitation of CVE-2026-106553 in the wild and no public exploit code.

All OpenSSH vulnerabilities

Sources

Also known as AZL-106706, BELL-CVE-2026-106553, CVE-2026-110924, DEBIAN-CVE-2026-106553, ECHO-609f-937d-deb9, GHSA-2xxv-m3rc-rvrm and 3 more.