CVE-2026-54590

mediumCVSS 5.9covered by 1 sourcefirst seen 2026-07-08

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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Exploitation outlook

Low exploitation risk0.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-54590: AsyncSSH is a Python package which provides an asynchronous client and server implementation o…nvd · 2026-07-08

External references

NVD record for CVE-2026-54590

CVE.org record

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