{"id":"CVE-2026-42011","title":"A flaw was found in gnutls","summary":"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 byp…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-295"],"published":"2026-05-07","updated":"2026-06-26","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42011","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:13274","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20611","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20612","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20613","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:26319","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:26409","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:29197","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:30004","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-42011","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2467437","label":"secalert@redhat.com"},{"url":"https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00475,"epssPercentile":0.40112,"ingestedAt":"2026-06-26T16:43:13.639Z","slug":"CVE-2026-42011","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}