Vulnerability Description
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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/sshnet/SSH.NET/commit/600be0de543765995a189b5d7cd4efac5007f3c
- https://github.com/sshnet/SSH.NET/releases/tag/2026.0.0
- https://github.com/sshnet/SSH.NET/security/advisories/GHSA-q939-rpr3-3284
FAQ
What is CVE-2026-48798?
CVE-2026-48798 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 SC...
How severe is CVE-2026-48798?
CVE-2026-48798 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48798?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.