CVE-2026-54591 Details
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.
A path traversal vulnerability has been identified in AsyncSSH versions prior to 2.23.1. This issue allows a malicious SSH server to write arbitrary files on the AsyncSSH SCP client's filesystem by sending filenames with '../' traversal sequences. The vulnerability arises because the '_parse_cd_args' function in 'scp.py' returns server-provided names without sanitization, and the '_recv_files' function joins these names to the destination path without enforcing directory boundaries. Exploitation can overwrite files like '~/.bashrc' or '~/.ssh/authorized_keys', potentially leading to code execution.
Users are advised to update AsyncSSH to version 2.23.1 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 8, 2026CISA-ADP
Assessed Jul 9, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de | [email protected] | Source CodeVendor |
| https://github.com/ronf/asyncssh/releases/tag/v2.23.1 | [email protected] | Source CodeVendor |
| https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| AsyncSSH | <= 2.23.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 9, 2026 | CVE Modified | CISA-ADP |
| Jul 8, 2026 | New CVE Received | [email protected] |