{"schemaVersion":3,"id":"USN-8799-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"libssh2 vulnerabilities\n\nIt was discovered that libssh2 incorrectly handled certain publickey\nsubsystem attributes. A remote attacker controlling a malicious SSH server\ncould use this issue to cause a denial of service or possibly execute\narbitrary code.\n(CVE-2026-58050)\n\nIt was discovered that libssh2 did not properly initialize publickey list\nentries before parsing. A remote attacker controlling a malicious SSH\nserver could use this issue to cause a denial of service or possibly\nexecute arbitrary code. (CVE-2026-58051)\n\nIt was discovered that libssh2 incorrectly handled certain SFTP server\nresponses. A remote attacker controlling an SSH server could use this issue\nto cause libssh2 to crash or possibly execute arbitrary code.\n(CVE-2026-66032)\n\nIt was discovered that libssh2 did not properly check bounds in certain\npublickey subsystem responses. A remote attacker controlling a malicious\nSSH server could use this issue to cause a denial of service or possibly\nexecute arbitrary code.. (CVE-2026-66034)","dates":{"published":"2026-09-22T03:58:05.000Z","modified":"2026-09-23T07:41:35.645Z","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":"libssh2","name":"libssh2","label":"libssh2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libssh2","purlType":"deb","versions":[{"text":"< 1.4.3-2ubuntu0.2+esm4","noFixRecorded":false,"fixedIn":null},{"text":"< 1.5.0-2ubuntu0.1+esm3","noFixRecorded":false,"fixedIn":null},{"text":"< 1.8.0-1ubuntu0.1+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 1.8.0-2.1ubuntu0.1+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 1.10.0-3ubuntu0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.4.3-2ubuntu0.2+esm4 | < 1.5.0-2ubuntu0.1+esm3 | < 1.8.0-1ubuntu0.1+esm1 | < 1.8.0-2.1ubuntu0.1+esm1 | < 1.10.0-3ubuntu0.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8799-1","label":"ubuntu.com/security/notices/USN-8799-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-58050","label":"ubuntu.com/security/CVE-2026-58050","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-58051","label":"ubuntu.com/security/CVE-2026-58051","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-66032","label":"ubuntu.com/security/CVE-2026-66032","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-66034","label":"ubuntu.com/security/CVE-2026-66034","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2026-58050","CVE-2026-58051","CVE-2026-66032","CVE-2026-66034"],"downstream":[],"duplicates":[],"related":["CVE-2026-58050","CVE-2026-58051","CVE-2026-66032","CVE-2026-66034"]},"timeline":[{"kind":"published","date":"2026-09-22T03:58:05.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-23T07:41:35.645Z","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":"2026-10-21T18:58:26.231Z","stale":false,"partial":false}}