{"schemaVersion":3,"id":"USN-2821-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"gnutls26 vulnerability\n\nIt was discovered that GnuTLS incorrectly validated the first byte of\npadding in CBC modes. A remote attacker could possibly use this issue to\nperform a padding oracle attack.","dates":{"published":"2015-11-30T20:04:50.000Z","modified":"2026-04-22T09:19:35.577Z","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":"gnutls26","name":"gnutls26","label":"gnutls26","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/gnutls26","purlType":"deb","versions":[{"text":"< 2.12.23-12ubuntu2.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.12.23-12ubuntu2.3","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-2821-1","label":"ubuntu.com/security/notices/USN-2821-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://launchpad.net/bugs/1510163","label":"launchpad.net/bugs/1510163","hostname":"launchpad.net","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":["CVE-2015-8313"]},"timeline":[{"kind":"published","date":"2015-11-30T20:04:50.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-22T09:19:35.577Z","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":"2026-10-20T03:42:58.481Z","stale":false,"partial":false}}