Security Advisory

CVE-2026-54590

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-08 20:36:45

Last updated 2026-07-10 15:00:21

Assigner GitHub_M

CVSS score 5.9

State PUBLISHED

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. 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.

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