{"cve":{"cve_id":"CVE-2026-45309","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":0.00592,"epss_percentile":0.47118,"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. Prior to 2.23.0, AsyncSSH expands the OpenSSH-compatible AuthorizedKeysFile %u token in asyncssh/config.py, asyncssh/connection.py, asyncssh/auth_keys.py, and asyncssh/misc.py with the raw SSH username during pre-authentication server config reload, allowing a server configured with AuthorizedKeysFile authorized_keys/%u to read an authorized-keys file outside the intended directory when the SSH username contains /, \\, or .. path traversal segments and authenticate with an attacker-selected key file. This issue is fixed in version 2.23.0.","published_at":"2026-07-17T18:40:02.428000Z","last_modified_at":"2026-10-24T20:10:00.137000Z","cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cvss_v3_severity":"HIGH","cvss_v4_score":8.2,"cvss_v4_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","cvss_v4_severity":"HIGH","ssvc_decision":null,"ssvc_exploitation":"poc","ssvc_automatable":true,"ssvc_technical_impact":"partial","cwes":["CWE-22"],"nvd_references":["https://github.com/ronf/asyncssh/security/advisories/GHSA-g794-3fmp-753h","https://github.com/ronf/asyncssh/commit/2af2382cce946c959a378a62f257af253dc4ab51","https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88"],"vuln_status":"Analyzed","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":"2026-07-17T19:35:28.549450Z","updated_at":"2026-10-25T03:30:54.432718Z"},"effective_severity":"HIGH","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":"L","value_label":"Low"},{"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":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"P","value_label":"Present"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"N","value_label":"None"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"asyncssh-project","vendor_name":"asyncssh_project","product_slug":"asyncssh","product_name":"asyncssh","version_start":null,"version_start_inclusive":null,"version_end":"2.23.0","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:asyncssh_project:asyncssh:*:*:*:*:*:*:*:*"},{"vendor_slug":"ronf","vendor_name":"ronf","product_slug":"asyncssh","product_name":"asyncssh","version_start":"< 2.23.0","version_start_inclusive":true,"version_end":"< 2.23.0","version_end_inclusive":true,"cpe23_uri":"cve5:ronf:asyncssh:< 2.23.0:< 2.23.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/ronf/asyncssh/security/advisories/GHSA-g794-3fmp-753h","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/ronf/asyncssh/commit/2af2382cce946c959a378a62f257af253dc4ab51","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-07-17T18:40:02.428000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-07-21T02:41:10.173779Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-21T02:41:10.173779Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-07-21T02:41:10.173779Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-07-31T08:23:04.751787Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-07-31T08:23:04.751787Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-07-31T08:23:04.751787Z","label":"CVSS score revised","source":"nvd"}]}