ronf asyncssh up to 2.23.0 SCP Client scp.py _parse_cd_args/_recv_files filenames path traversal

Summaryinfo

A vulnerability was found in ronf asyncssh up to 2.23.0. It has been rated as critical. The impacted element is the function _parse_cd_args/_recv_files of the file scp.py of the component SCP Client. This manipulation of the argument filenames causes path traversal. The identification of this vulnerability is CVE-2026-54591. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in ronf asyncssh up to 2.23.0. It has been declared as critical. Affected by this vulnerability is the function _parse_cd_args/_recv_files of the file scp.py of the component SCP Client. The manipulation of the argument filenames with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-23. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-54591 since 06/15/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 2.23.1 eliminates this vulnerability.

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Productinfo

Vendor

• ronf

Name

• asyncssh

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23.0

Website

• Product: https://github.com/ronf/asyncssh/

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CPE 2.2info

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