{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-54590", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-15T19:45:23.538Z", "datePublished": "2026-07-08T20:36:45.258Z", "dateUpdated": "2026-07-08T20:36:45.258Z"}, "containers": {"cna": {"title": "AsyncSSH AuthorizedKeysFile username substitution bypass through ~ and environment expansion", "problemTypes": [{"descriptions": [{"cweId": "CWE-22", "lang": "en", "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-639", "lang": "en", "description": "CWE-639: Authorization Bypass Through User-Controlled Key", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/ronf/asyncssh/security/advisories/GHSA-qr67-gv47-xwwh", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/ronf/asyncssh/security/advisories/GHSA-qr67-gv47-xwwh"}, {"name": "https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88", "tags": ["x_refsource_MISC"], "url": "https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88"}, {"name": "https://github.com/ronf/asyncssh/releases/tag/v2.23.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/ronf/asyncssh/releases/tag/v2.23.1"}], "affected": [{"vendor": "ronf", "product": "asyncssh", "versions": [{"version": "< 2.23.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T20:36:45.258Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-qr67-gv47-xwwh", "discovery": "UNKNOWN"}}}}

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