---
id: CVE-2026-85756
title: SSH.NET is a Secure Shell (SSH) library for .NET
summary: >-
  SSH.NET is a Secure Shell (SSH) library for .NET. Prior to 2026.0.0, ScpClient
  places caller-supplied remote paths into the command used to run scp on the
  server, and the default RemotePathTransformation.DoubleQuote transformation
  cannot…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
vendor: sshnet
product: SSH.NET
affected:
  - SSH.NET < 2026.0.0
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:17:51.407'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85756'
references:
  - url: >-
      https://github.com/sshnet/SSH.NET/commit/c66b9f8fb06c12e71761e58a577b1e796026310f
    label: security-advisories@github.com
  - url: 'https://github.com/sshnet/SSH.NET/releases/tag/2026.0.0'
    label: security-advisories@github.com
  - url: 'https://github.com/sshnet/SSH.NET/security/advisories/GHSA-mggc-4xg6-vcxf'
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85756'
  - url: 'https://github.com/advisories/GHSA-mggc-4xg6-vcxf'
tags:
  - nvd
  - cve.org
  - ghsa
  - nuget
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-16T18:21:23.551674Z'
ingestedAt: '2026-09-16T16:59:56.551Z'
aliases:
  - GHSA-mggc-4xg6-vcxf
ecosystem: nuget
patched:
  - SSH.NET 2026.0.0
epss: 0.00575
epssPercentile: 0.46213
---

## Overview

SSH.NET is a Secure Shell (SSH) library for .NET. Prior to 2026.0.0, ScpClient places caller-supplied remote paths into the command used to run scp on the server, and the default RemotePathTransformation.DoubleQuote transformation cannot safely quote every remote command interpreter. When an application passes an attacker-controlled path to a shell-based server, shell metacharacters not neutralized by the active IRemotePathTransformation can execute commands as the authenticated SSH user. Exploitation requires a shell-based server and a path crafted for that shell's parsing rules; non-shell servers and paths fully neutralized by the selected transformation are not affected. RemotePathTransformation.ShellQuote is available for POSIX shells, while SftpClient avoids a remote shell entirely. This issue is fixed in version 2026.0.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-85756)

Affected packages:

- `SSH.NET < 2026.0.0`

Patched in:

- `SSH.NET 2026.0.0`

Source: https://github.com/advisories/GHSA-mggc-4xg6-vcxf