CVE-2026-48798

HIGH 7.1

SSH.NET: ScpClient Recursive Download Allows Arbitrary File Write via Server-Controlled SCP Filenames

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22 CWE-73
Vendor	sshnet
Product	ssh.net
Published	Aug 18, 2026
Last Updated	Aug 18, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

Low

Affected Versions

sshnet / SSH.NET

< 2026.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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