AIKIDO-2026-918779
asyncssh is vulnerable to Path Traversal
65
Medium Risk
This Affects:
asyncsshTL;DR
SFTPClient._copy() in asyncssh/sftp.py joins each server supplied filename from an SFTP readdir response onto the local destination directory, checking only for exact . and .. names. A malicious or compromised SFTP server can return an absolute path or a filename containing ../ during a recursive get(), mget(), or copy(), so the client writes the file outside the requested destination directory. This SFTP recursive copy logic has no filename guard from the earlier SCP path traversal fix. The patch checks server supplied filenames before joining them onto the local destination path.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use SFTPClient.get(), mget(), or copy() to recursively download from an untrusted or compromised SFTP server.
Background info
asyncssh is vulnerable to Path Traversal in versions 0.0.1 - 2.24.0.
How to fix this
Upgrade the asyncssh library to the patch version.
Are You Affected?
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SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
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