{"cve":{"cve_id":"CVE-2026-54590","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00393,"epss_percentile":0.31834,"epss_as_of":"2026-10-15","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.","published_at":"2026-07-08T20:36:45.258000Z","last_modified_at":"2026-10-25T17:10:00.197000Z","cvss_v3_score":5.9,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"poc","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-22","CWE-639"],"nvd_references":["https://github.com/ronf/asyncssh/security/advisories/GHSA-qr67-gv47-xwwh","https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88","https://github.com/ronf/asyncssh/releases/tag/v2.23.1"],"vuln_status":"Deferred","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-07-08T21:19:37.052417Z","updated_at":"2026-10-25T22:44:01.077292Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"ronf","vendor_name":"ronf","product_slug":"asyncssh","product_name":"asyncssh","version_start":"< 2.23.1","version_start_inclusive":true,"version_end":"< 2.23.1","version_end_inclusive":true,"cpe23_uri":"cve5:ronf:asyncssh:< 2.23.1:< 2.23.1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/ronf/asyncssh/security/advisories/GHSA-qr67-gv47-xwwh","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/ronf/asyncssh/releases/tag/v2.23.1","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-07-08T20:36:45.258000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-07-10T15:34:20.781021Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-10T15:34:20.781021Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-10T15:34:20.781021Z","label":"SSVC decision revised","source":"vulnrichment"}]}