---
id: CVE-2026-48798
title: SSH.NET is a Secure Shell (SSH) library for .NET
summary: >-
  SSH.NET is a Secure Shell (SSH) library for .NET. In 2025.1.0 and earlier,
  ScpClient.Download(string directoryName, DirectoryInfo directoryInfo) trusts
  file and directory names returned by a remote SCP server and combines them
  with the r…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L'
cwe:
  - CWE-22
  - CWE-73
vendor: SSH
product: SSH.NET
affected:
  - SSH.NET <= 2025.1.0
patched:
  - SSH.NET 2026.0.0
published: '2026-08-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:05:53.723'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48798'
references:
  - url: >-
      https://github.com/sshnet/SSH.NET/commit/600be0de543765995a189b5d7cd4efac5007f3ce
    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-q939-rpr3-3284'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-q939-rpr3-3284'
tags:
  - nvd
  - ghsa
  - nuget
epss: 0.00421
epssPercentile: 0.33792
aliases:
  - GHSA-q939-rpr3-3284
ecosystem: nuget
ingestedAt: '2026-08-12T15:53:05.887Z'
---

## Overview

SSH.NET is a Secure Shell (SSH) library for .NET. In 2025.1.0 and earlier, ScpClient.Download(string directoryName, DirectoryInfo directoryInfo) trusts file and directory names returned by a remote SCP server and combines them with the requested local directory without containment validation, allowing a malicious, compromised, or man-in-the-middle server to use ../ sequences or absolute paths to create or overwrite files anywhere writable by the client process. 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-2026-48798)

Affected packages:

- `SSH.NET <= 2025.1.0`

Patched in:

- `SSH.NET 2026.0.0`

Source: https://github.com/advisories/GHSA-q939-rpr3-3284