High 7.1Published Aug 18, 2026

CVE-2026-48798SSH.NET: ScpClient Recursive Download Allows Arbitrary File Write via Server-Controlled SCP Filenames

Updated under an hour ago (2026-10-19 09:00 UTC)

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It affects sshnet SSH.NET. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for sshnet SSH.NET

Exploited in the last 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.

CVSS: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L
Weakness (CWE): CWE-22, CWE-73
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Aug 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

sshnet SSH.NET sshnet:ssh.net (from the name)	before 2026.0.0	CNA record

References

https://github.com/sshnet/SSH.NET/security/advisories/GHSA-q939-rpr3-3284x-refsource-confirm
https://github.com/sshnet/SSH.NET/commit/600be0de543765995a189b5d7cd4efac5007f3cex-refsource-misc
https://github.com/sshnet/SSH.NET/releases/tag/2026.0.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.