CVE-2026-106555 Auth bypass in OpenSSH
Attackers may bypass authentication in OpenSSH when GSSAPI is enabled due to state persistence across attempts.
- 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-2026-106555?
CVE-2026-106555 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, GSSAPIAuthentication authentication state can incorrectly be persisted across authentication attempts.
Weakness: CWE-669
Which versions are affected by CVE-2026-106555?
It affects 1 product.
Products include OpenSSH.
How do I fix CVE-2026-106555?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-106555 being exploited?
There is no known exploitation of CVE-2026-106555 in the wild and no public exploit code.
Other vulnerabilities in OpenSSH
Sources
Also known as AZL-106709, BELL-CVE-2026-106555, DEBIAN-CVE-2026-106555, ECHO-a770-d49a-4681, GHSA-j45v-7hgc-xv9x, ROOT-OS-DEBIAN-12-CVE-2026-106555 and 2 more.