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.

CVSS v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/sshnet/SSH.NET/commit/600be0de543765995a189b5d7cd4efac5007f3ce
https://github.com/sshnet/SSH.NET/releases/tag/2026.0.0
https://github.com/sshnet/SSH.NET/security/advisories/GHSA-q939-rpr3-3284

Configurations

No configuration.

History

22 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) SSH.NET es una biblioteca Secure Shell (SSH) para .NET. En las versiones 2025.1.0 y anteriores, ScpClient.Download(string directoryName, DirectoryInfo directoryInfo) confía en los nombres de archivo y directorio devueltos por un servidor SCP remoto y los combina con el directorio local solicitado sin validación de contención, permitiendo que un servidor malicioso, comprometido o man-in-the-middle utilice secuencias .. / o rutas absolutas para crear o sobrescribir archivos en cualquier lugar donde el proceso del cliente tenga permisos de escritura. Este problema se ha solucionado en la versión 2026.0.0.

Information

Published : 2026-08-18 15:16

Updated : 2026-10-22 22:10

NVD link : CVE-2026-48798

Mitre link : CVE-2026-48798

CVE.ORG link : CVE-2026-48798

JSON object : View

Products Affected

No product.

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-73

External Control of File Name or Path

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