{"id":"CVE-2026-42012","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-42012","generatedAt":"2026-10-28T03:22:35.090Z","title":"A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs).","description":"A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.","published":"2026-05-26T22:16:42.000Z","lastModified":"2026-10-14T20:17:43.000Z","status":"Awaiting Analysis","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N"},"cwe":["CWE-295"],"affected":[],"epss":{"score":0.00354,"percentile":0.28801,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:13274","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20611","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20612","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20613","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:26319","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:26409","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:29197","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:30004","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:30849","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:30850","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:32962","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:33125","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:41921","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:43575","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:58981","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:72502","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:74674","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82304","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82322","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82347","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82354","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82372","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82857","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82888","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-42012","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2467441","source":"secalert@redhat.com"},{"url":"https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-7","source":"secalert@redhat.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-42012","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}