CVE-2026-48798: Sshnet Ssh.net

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Sshnet Ssh.net: before 2026.0.0 (fixed in 2026.0.0)

Published 2026-08-18. Last modified 2026-09-18.