Directory Traversal Affecting py3.12-asyncssh package, versions <2.24.0-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-PY312ASYNCSSH-19158598
- published22 Aug 2026
- disclosed8 Jul 2026
Introduced: 8 Jul 2026
CVE-2026-54590 (opens in a new tab)How to fix?
Upgrade Minimos:latest py3.12-asyncssh to version 2.24.0-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream py3.12-asyncssh package and not the py3.12-asyncssh package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
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.
References
- https://www.cve.org/CVERecord?id=CVE-2026-54590
- https://osv.dev/vulnerability/MINI-c428-pwrv-rr6c
- https://osv.dev/vulnerability/CVE-2026-54590
- https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88
- https://github.com/ronf/asyncssh/releases/tag/v2.23.1
- https://github.com/ronf/asyncssh/security/advisories/GHSA-qr67-gv47-xwwh