CVE-2026-54591— AsyncSSH: SCP Path Traversal to Arbitrary File Write
Quick assessment
Affected
ronf asyncssh
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.
Ron Frederick AsyncSSH是Ron Frederick个人开发者的一款异步SSH协议库。 Ron Frederick AsyncSSH 2.23.1之前版本存在路径遍历漏洞，该漏洞源于SCP客户端未对服务器提供的文件名进行路径边界检查，可能允许恶意SSH服务器发送包含../遍历序列的文件名，从而在客户端文件系统上写入任意文件。
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I. Basic Information for CVE-2026-54591
Vulnerability Information
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Vulnerability Title
AsyncSSH: SCP Path Traversal to Arbitrary File Write
Source: CVE Program / CVE List V5
Vulnerability Description
AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. This issue is fixed in version 2.23.1.
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:H
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
Ron Frederick AsyncSSH 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ron Frederick AsyncSSH是Ron Frederick个人开发者的一款异步SSH协议库。 Ron Frederick AsyncSSH 2.23.1之前版本存在路径遍历漏洞，该漏洞源于SCP客户端未对服务器提供的文件名进行路径边界检查，可能允许恶意SSH服务器发送包含../遍历序列的文件名，从而在客户端文件系统上写入任意文件。
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
II. Public POCs for CVE-2026-54591
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Qwen3.6-35B-A3B
· 14503 chars
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III. Intelligence Information for CVE-2026-54591
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Patches & Fixes for CVE-2026-54591 (1)
-
🔗 Fix SCP path traversal issue · ronf/asyncssh@d730803 · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-54591 (1)
Other References for CVE-2026-54591 (1)
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🔗 Release v2.23.1 · ronf/asyncssh · GitHub x_refsource_MISC
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V. Comments for CVE-2026-54591
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