# CVE-2026-106555: Auth bypass in OpenSSH

> Attackers may bypass authentication in OpenSSH when GSSAPI is enabled due to state persistence across attempts.

- **Severity:** Low 2.2 (`CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N`)
- **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:** Yes
- **Published:** 6 Oct 2026
- **Updated:** 9 Oct 2026
- **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, ROOT-OS-DEBIAN-13-CVE-2026-106555, UBUNTU-CVE-2026-106555

## 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 (Incorrect Resource Transfer Between Spheres)

## Which versions are affected by CVE-2026-106555?

It affects 1 product.


Products: OpenSSH.

## How do I fix CVE-2026-106555?

Upgrade to a fixed version.

## 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

- [CVE-2003-0786](https://insights.sbomify.com/CVE-2003-0786/): Auth bypass in n/a (critical 10.0)
- [CVE-2003-0693](https://insights.sbomify.com/CVE-2003-0693/): Memory corruption in n/a (critical 10.0)
- [CVE-2002-0640](https://insights.sbomify.com/CVE-2002-0640/): Memory corruption in n/a (critical 10.0)
- [CVE-2001-0144](https://insights.sbomify.com/CVE-2001-0144/): Integer overflow in n/a (critical 10.0)
- [CVE-2000-0999](https://insights.sbomify.com/CVE-2000-0999/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-106555 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-106555 in the wild and no public exploit code.

Affected product: OpenSSH. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-106555/ (Markdown: https://insights.sbomify.com/CVE-2026-106555/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-106555
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-106555
- OSV: https://osv.dev/vulnerability/CVE-2026-106555

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-106555/
Summaries are generated and may contain mistakes; the official description above is the record.