{"schemaVersion":3,"id":"USN-8721-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"openssh vulnerabilities\n\nIt was discovered that OpenSSH's ssh-agent incorrectly handled interactions\nbetween agent locking and the session-bind@openssh.com extension. A remote\nattacker with access to a forwarded agent connection could possibly use\nthis issue to perform operations that should only be available locally,\nsuch as adding tokens or using keys. (CVE-2026-73281)\n\nIt was discovered that OpenSSH's ssh client incorrectly handled concurrent\nremote-forwarding operations. A remote attacker could possibly use this\nissue to cause a use-after-free condition, resulting in a denial of service\nor the execution of arbitrary code. (CVE-2026-73282)\n\nIt was discovered that OpenSSH's sshd server incorrectly applied the\nrestrict keyword from authorized_keys to tunnel forwarding requests. A\nlocal attacker with an authorized key could possibly use this issue to\nbypass intended tunnel forwarding restrictions. (CVE-2026-73283)","dates":{"published":"2026-09-03T12:30:15.000Z","modified":"2026-09-03T22:56:55.264Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"openssh","name":"openssh","label":"openssh","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/openssh","purlType":"deb","versions":[{"text":"< 1:8.9p1-3ubuntu0.17","noFixRecorded":false,"fixedIn":null},{"text":"< 1:9.6p1-3ubuntu13.19","noFixRecorded":false,"fixedIn":null},{"text":"< 1:10.2p1-2ubuntu3.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:8.9p1-3ubuntu0.17 | < 1:9.6p1-3ubuntu13.19 | < 1:10.2p1-2ubuntu3.6","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8721-1","label":"ubuntu.com/security/notices/USN-8721-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-73281","label":"ubuntu.com/security/CVE-2026-73281","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-73282","label":"ubuntu.com/security/CVE-2026-73282","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-73283","label":"ubuntu.com/security/CVE-2026-73283","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2026-73281","CVE-2026-73282","CVE-2026-73283"],"downstream":[],"duplicates":[],"related":["CVE-2026-73281","CVE-2026-73282","CVE-2026-73283"]},"timeline":[{"kind":"published","date":"2026-09-03T12:30:15.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-03T22:56:55.264Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T00:07:06.854Z","stale":false,"partial":false}}