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

Quick assessment

Affected
sshnet SSH.NET
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SSH.NET是SSH.NET组织开源的一个针对并行优化的SSH库。 SSH.NET 2026.0.0之前版本存在安全漏洞，该漏洞源于ScpClient.Download方法信任远程SCP服务器返回的文件和目录名，未进行包含验证，可能导致恶意、被入侵或中间人服务器通过../序列或绝对路径创建或覆盖客户端进程可写任意位置的文件。

CVSS 7.1 · High EPSS 0.42% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
sshnet SSH.NET < 2026.0.0 affected
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I. Basic Information for CVE-2026-48798

Vulnerability Information
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Vulnerability Title
SSH.NET: ScpClient Recursive Download Allows Arbitrary File Write via Server-Controlled SCP Filenames
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
SSH.NET 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SSH.NET是SSH.NET组织开源的一个针对并行优化的SSH库。 SSH.NET 2026.0.0之前版本存在安全漏洞，该漏洞源于ScpClient.Download方法信任远程SCP服务器返回的文件和目录名，未进行包含验证，可能导致恶意、被入侵或中间人服务器通过../序列或绝对路径创建或覆盖客户端进程可写任意位置的文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sshnet SSH.NET < 2026.0.0 -

II. Public POCs for CVE-2026-48798

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 10274 chars
GitHub 复现环境（可 clone 直接跑）
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POC zip download
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III. Intelligence Information for CVE-2026-48798

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Patches & Fixes for CVE-2026-48798 (1)

Vendor Advisories for CVE-2026-48798 (1)

Vendor Pages for CVE-2026-48798 (1)

IV. Related Vulnerabilities

Same product: SSH.NET
Same vendor: sshnet
Same weakness: CWE-22

V. Comments for CVE-2026-48798

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