CVE WatchJul 10, 2026

CVE-2026-54590

AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyn

CVSS

5.9

Medium

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Jul 10, 2026 · CWE-22 · CWE-639

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-07-092026-07-21

Technical 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.

Official references

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