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CVE-2026-77473— AsyncSSH: SFTP Recursive Copy Path Traversal via Unsanitized Server-Supplied Filenames

Quick assessment

Affected
ronf asyncssh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AsyncSSH 是一个基于 Python asyncio 框架的 Python 软件包，提供 SSHv2 协议的异步客户端和服务器实现。在 2.24.1 版本之前，位于 asyncssh/sftp.py 中的 SFTPClient._copy() 方法（可通过 get()、mget() 和 copy() 方法调用）在执行递归的远程到本地 SFTP 复制时，会直接信任由远程服务器目录枚举返回的文件名。恶意或已被攻陷的 SFTP 服务器可返回绝对路径文件名，或包含路径分隔符及父目录遍历序列（如 ".."）的文件名，从

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-77473

Vulnerability Information
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Vulnerability Title
AsyncSSH: SFTP Recursive Copy Path Traversal via Unsanitized Server-Supplied Filenames
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 2.24.1, recursive remote-to-local SFTP copies in SFTPClient._copy() in asyncssh/sftp.py, reached through get(), mget(), and copy(), trust filenames returned by a remote server's directory enumeration. A malicious or compromised SFTP server can return an absolute filename or a filename containing path separators and parent-directory traversal, causing destination path construction to escape the requested local directory and write attacker-selected content to locations writable by the client process. This issue is fixed in version 2.24.1.
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:N
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
ronf asyncssh < 2.24.1 -

II. Public POCs for CVE-2026-77473

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III. Intelligence Information for CVE-2026-77473

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Other References for CVE-2026-77473 (3)

IV. Related Vulnerabilities

Same product: asyncssh
Same vendor: ronf
Same weakness: CWE-22