CVE-2026-54591

Published: Jul 8, 2026Modified: Jul 10, 2026Deferred

8.1

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Exploitability: 2.8 / Impact: 5.2

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References (3)

https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de

Source: security-advisories@github.com

https://github.com/ronf/asyncssh/releases/tag/v2.23.1

Source: security-advisories@github.com

https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f

Source: security-advisories@github.com

Timeline

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