# CVE-2026-59997: Security feature bypass in OpenSSH

> OpenSSH internal-sftp ignores command-line arguments beyond the ninth, potentially bypassing intended security restrictions on SFTP connections.

- **Severity:** Medium 4.2 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 8 Jul 2026
- **Updated:** 8 Jul 2026
- **Also known as:** ALPINE-CVE-2026-59997, AZL-92036, BELL-CVE-2026-59997, DEBIAN-CVE-2026-59997, ECHO-94a5-77ee-11fa, GHSA-56r6-6mmg-25j5, JLSEC-2026-1321, ROOT-OS-DEBIAN-11-CVE-2026-59997, ROOT-OS-DEBIAN-12-CVE-2026-59997, ROOT-OS-DEBIAN-13-CVE-2026-59997, UBUNTU-CVE-2026-59997

## What is CVE-2026-59997?

CVE-2026-59997 is a medium-severity vulnerability in OpenSSH, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

internal-sftp in sshd in OpenSSH before 10.4 recognizes only the first 9 command-line arguments, which can be important if a later command-line argument would have helped to ensure the intended security properties of an SFTP connection.

Weakness: CWE-1284 (Improper Validation of Specified Quantity in Input)

## Which versions are affected by CVE-2026-59997?

It affects 1 product.


Products: OpenSSH.

## How do I fix CVE-2026-59997?

Upgrade to a fixed version.

## Is CVE-2026-59997 being exploited?

There is no known exploitation of CVE-2026-59997 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-2026-59997 and fix it if it is affected.

What it is: CVE-2026-59997 is a medium-severity vulnerability in OpenSSH, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-59997 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-2026-59997/ (Markdown: https://insights.sbomify.com/CVE-2026-59997/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-59997
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-59997
- OSV: https://osv.dev/vulnerability/CVE-2026-59997

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-59997/
Summaries are generated and may contain mistakes; the official description above is the record.