{"schemaVersion":3,"id":"CVE-2026-42011","aliases":["ALPINE-CVE-2026-42011","UBUNTU-CVE-2026-42011","DEBIAN-CVE-2026-42011"],"status":"published","duplicateOf":null,"title":null,"description":"A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.","dates":{"published":"2026-05-07T13:51:04.695Z","modified":"2026-10-14T19:25:25.848Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.4,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.4,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Alpine","score":7.4,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":5.6,"impact":8.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.4,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":5.6,"impact":8.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.4,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":5.6,"impact":8.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.4,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00475,"percentile":0.39736,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00475},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00475,"percentile":0.39736}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0057,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00475,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00475,"percentile":0.39736}]},"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":[{"id":"CWE-295","name":"Improper Certificate Validation","description":"The product does not validate, or incorrectly validates, a certificate.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/295.html"}],"affected":[{"vendor":"alpine","product":"gnutls","name":"gnutls","label":"gnutls","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/gnutls","purlType":"apk","versions":[{"text":"< 3.8.13-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.8.13-r0","eol":null,"hubHref":null},{"vendor":"debian","product":"gnutls28","name":"gnutls28","label":"gnutls28","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/gnutls28","purlType":"deb","versions":[{"text":"< 3.7.9-2+deb12u7","noFixRecorded":false,"fixedIn":null},{"text":"< 3.8.9-3+deb13u4","noFixRecorded":false,"fixedIn":null},{"text":"< 3.8.13-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.7.9-2+deb12u7 | < 3.8.9-3+deb13u4 | < 3.8.13-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"gnutls28","name":"gnutls28","label":"gnutls28","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/gnutls28","purlType":"deb","versions":[{"text":"< 3.5.18-1ubuntu1.6+esm4","noFixRecorded":false,"fixedIn":null},{"text":"< 3.6.13-2ubuntu1.12+esm3","noFixRecorded":false,"fixedIn":null},{"text":"< 3.7.3-4ubuntu1.9","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 3.7.3-4ubuntu1.9+Fips1","noFixRecorded":false,"fixedIn":null},{"text":"< 3.8.3-1.1ubuntu3.6","noFixRecorded":false,"fixedIn":null},{"text":"< 3.8.3-1.1ubuntu3.6+Fips1.2","noFixRecorded":false,"fixedIn":null},{"text":"< 3.8.9-3ubuntu2.2","noFixRecorded":false,"fixedIn":null},{"text":"< 3.8.12-2ubuntu1.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.5.18-1ubuntu1.6+esm4 | < 3.6.13-2ubuntu1.12+esm3 | < 3.7.3-4ubuntu1.9 | All versions (No fix recorded) | < 3.7.3-4ubuntu1.9+Fips1 | < 3.8.3-1.1ubuntu3.6 | < 3.8.3-1.1ubuntu3.6+Fips1.2 | < 3.8.9-3ubuntu2.2 | < 3.8.12-2ubuntu1.1","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:13274","label":"access.redhat.com/errata/RHSA-2026:13274","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20611","label":"access.redhat.com/errata/RHSA-2026:20611","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20612","label":"access.redhat.com/errata/RHSA-2026:20612","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20613","label":"access.redhat.com/errata/RHSA-2026:20613","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:26319","label":"access.redhat.com/errata/RHSA-2026:26319","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:26409","label":"access.redhat.com/errata/RHSA-2026:26409","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:29197","label":"access.redhat.com/errata/RHSA-2026:29197","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:30004","label":"access.redhat.com/errata/RHSA-2026:30004","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:30849","label":"access.redhat.com/errata/RHSA-2026:30849","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:30850","label":"access.redhat.com/errata/RHSA-2026:30850","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:32962","label":"access.redhat.com/errata/RHSA-2026:32962","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:33125","label":"access.redhat.com/errata/RHSA-2026:33125","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:40762","label":"access.redhat.com/errata/RHSA-2026:40762","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:41921","label":"access.redhat.com/errata/RHSA-2026:41921","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:43575","label":"access.redhat.com/errata/RHSA-2026:43575","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:56853","label":"access.redhat.com/errata/RHSA-2026:56853","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:57483","label":"access.redhat.com/errata/RHSA-2026:57483","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:58981","label":"access.redhat.com/errata/RHSA-2026:58981","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:59831","label":"access.redhat.com/errata/RHSA-2026:59831","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:60019","label":"access.redhat.com/errata/RHSA-2026:60019","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:72502","label":"access.redhat.com/errata/RHSA-2026:72502","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:74674","label":"access.redhat.com/errata/RHSA-2026:74674","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-42011","label":"access.redhat.com/security/cve/CVE-2026-42011","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2467437","label":"bugzilla.redhat.com/show_bug.cgi?id=2467437","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT"]},{"url":"https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6","label":"www.gnutls.org/security-new.html","hostname":"www.gnutls.org","tags":["REPORT"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-42011","label":"security.alpinelinux.org/vuln/CVE-2026-42011","hostname":"security.alpinelinux.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-42011","label":"ubuntu.com/security/CVE-2026-42011","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-42011","label":"www.cve.org/CVERecord?id=CVE-2026-42011","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-8284-1","label":"ubuntu.com/security/notices/USN-8284-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/notices/USN-8539-1","label":"ubuntu.com/security/notices/USN-8539-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-42011","label":"security-tracker.debian.org/tracker/CVE-2026-42011","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:82304","label":"access.redhat.com/errata/RHSA-2026:82304","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:82322","label":"access.redhat.com/errata/RHSA-2026:82322","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:82347","label":"access.redhat.com/errata/RHSA-2026:82347","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:82354","label":"access.redhat.com/errata/RHSA-2026:82354","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:82372","label":"access.redhat.com/errata/RHSA-2026:82372","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:82857","label":"access.redhat.com/errata/RHSA-2026:82857","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:82888","label":"access.redhat.com/errata/RHSA-2026:82888","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:10691-1","RHSA-2026:13274","RHSA-2026:20611","RHSA-2026:20612","RHSA-2026:20613","RHSA-2026:26409","RHSA-2026:30004","RHSA-2026:30849","RHSA-2026:30850","RHSA-2026:32962","RHSA-2026:33125","RHSA-2026:41921","RHSA-2026:43575","SUSE-SU-2026:2822-1","SUSE-SU-2026:2923-1","SUSE-SU-2026:2924-1","USN-8539-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:10691-1","SUSE-SU-2026:2822-1","SUSE-SU-2026:2923-1","SUSE-SU-2026:2924-1","USN-8284-1","USN-8539-1"]},"timeline":[{"kind":"published","date":"2026-05-07T13:51:04.695Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-14T19:25:25.848Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T19:45:31.383Z","stale":false,"partial":false}}