python-asyncssh: AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on...
CVE-2026-54591 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-54591, released July 8, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-asyncssh · Debian 14 | 2.24.0-1 | DEBIAN-CVE-2026-54591 | Jul 8, 2026 |
| python-asyncssh · Fedora 43 | 2.23.1-1.fc43 | FEDORA-2026-574496D9AE | Jul 11, 2026 |
| python3-asyncssh · Fedora 43 | 2.23.1-1.fc43 | FEDORA-2026-574496D9AE | Jul 11, 2026 |
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