python-asyncssh: AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on...
CVE-2026-54590 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-54590, released July 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.
AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Version 2.23.0 contains an incomplete fix for CVE-2026-45309 in SSHServerConfig._set_tokens that blocks /, , and .. before %u substitution in AuthorizedKeysFile but does not block a leading ~ or ${ENV}, allowing later expansion in _expand_val and Path(filename).expanduser() to escape the intended authorized-keys directory. 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-2026-54590 | 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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