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Vulnerability record · CVE-2026-54591 · published 8 July 2026

CVE-2026-54591: Path traversal vulnerability

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.

8.1 CVSS 3.1 High EPSS 0.49% · top 60.2% CWE-22 · Path traversal Deferred
8.1CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
10 Jul 2026Last modified by NVD

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-54591), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.