CVE-2026-54591

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.

Score

CVSS 3.1 8.1 High

Status

Deferred - security-advisories@github.com

Published

2026-07-08

Last modified

2026-10-25

Weaknesses

CWE-22

Affected products

• Asyncssh (Ronf)

References

• https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f
• https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de
• https://github.com/ronf/asyncssh/releases/tag/v2.23.1