{"id":"USN-2821-1","aliases":[],"status":"published","title":"gnutls26 vulnerability","description":"It 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.","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2015-11-30T20:04:50Z","modified":"2026-04-22T09:19:35Z","fixes":[{"ecosystem":"Ubuntu:14.04:LTS","package":"gnutls26","fixed_in":["2.12.23-12ubuntu2.3"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"gnutls26","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.12.23-12ubuntu2.3"}]}],"versions":["2.12.23-1ubuntu4","2.12.23-1ubuntu5","2.12.23-12ubuntu1","2.12.23-12ubuntu2","2.12.23-12ubuntu2.1","2.12.23-12ubuntu2.2"]}],"references":[{"url":"https://ubuntu.com/security/notices/USN-2821-1","tags":["advisory"]},{"url":"https://launchpad.net/bugs/1510163","tags":["report"]}],"sources":{"osv":[{"id":"USN-2821-1","title":"gnutls26 vulnerability","description":"It 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.\n","status":"published","published":"2015-11-30T20:04:50Z","modified":"2026-04-22T09:19:35.577799Z","updated_at":"2026-11-02T16:58:10.303275Z"}]}}