CVE-2026-54591
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductAsyncssh
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- asyncssh2.23.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| asyncsshPyPI | v < 2.23.1 | 2.23.1 |
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