Path Traversal in Sshnet Ssh.net
CVE-2026-48798
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.
Vulnerability class: Path Traversal (Directory Traversal)
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L.
Affected products
- Sshnet Ssh.net — versions < 2026.0.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-48798?
- CVE-2026-48798 is a high-severity vulnerability in Sshnet Ssh.net, classified under Path Traversal. CVSS score: 7.1/10. Published 2026-08-18.
- How severe is CVE-2026-48798?
- High severity. CVSS v3 base score is 7.1 out of 10.