{"schemaVersion":3,"id":"USN-8539-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"gnutls28 vulnerabilities\n\nHaruto Kimura discovered that GnuTLS did not properly apply permitted\nname constraints in certain certificate validation paths. A remote\nattacker could possibly use this issue to bypass certificate validation,\nleading to a machine-in-the-middle attack. (CVE-2026-42011)\n\nOleh Konko discovered that GnuTLS incorrectly fell back to Common Name\nchecks for certain URI and SRV subject alternative names. A remote\nattacker could possibly use this issue to bypass certificate validation,\nleading to a machine-in-the-middle attack. (CVE-2026-42012)\n\nHaruto Kimura and Joshua Rogers discovered that GnuTLS incorrectly fell\nback to Common Name checks when subject alternative names were\noversized. A remote attacker could possibly use this issue to bypass\ncertificate validation, leading to a machine-in-the-middle attack.\n(CVE-2026-42013)\n\nLuigino Camastra and Joshua Rogers discovered that GnuTLS had a\nuse-after-free issue when changing PKCS#11 token security officer PINs\nin certain cases. An attacker could possibly use this issue to cause\nGnuTLS to crash, resulting in a denial of service, or execute arbitrary\ncode. (CVE-2026-42014)\n\nZou Dikai discovered that GnuTLS did not properly validate PKCS#12 bag\nsizes in certain cases. An attacker could possibly use this issue to\ncause GnuTLS to crash, resulting in a denial of service, or execute\narbitrary code. (CVE-2026-42015)","dates":{"published":"2026-07-14T15:16:35.000Z","modified":"2026-07-14T23:44:42.938Z","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":"gnutls28","name":"gnutls28","label":"gnutls28","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/gnutls28","purlType":"deb","versions":[{"text":"< 3.4.10-4ubuntu1.9+esm4","noFixRecorded":false,"fixedIn":null},{"text":"< 3.5.18-1ubuntu1.6+esm4","noFixRecorded":false,"fixedIn":null},{"text":"< 3.6.13-2ubuntu1.12+esm3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.4.10-4ubuntu1.9+esm4 | < 3.5.18-1ubuntu1.6+esm4 | < 3.6.13-2ubuntu1.12+esm3","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8539-1","label":"ubuntu.com/security/notices/USN-8539-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-42011","label":"ubuntu.com/security/CVE-2026-42011","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-42012","label":"ubuntu.com/security/CVE-2026-42012","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-42013","label":"ubuntu.com/security/CVE-2026-42013","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-42014","label":"ubuntu.com/security/CVE-2026-42014","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-42015","label":"ubuntu.com/security/CVE-2026-42015","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2026-42011","CVE-2026-42012","CVE-2026-42013","CVE-2026-42014","CVE-2026-42015"],"downstream":[],"duplicates":[],"related":["CVE-2026-42011","CVE-2026-42012","CVE-2026-42013","CVE-2026-42014","CVE-2026-42015"]},"timeline":[{"kind":"published","date":"2026-07-14T15:16:35.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-14T23:44:42.938Z","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":"2026-10-20T01:37:01.218Z","stale":false,"partial":false}}