{"id":"CVE-2026-88648","title":"Incomplete X.509 implementation in GnuTLS v3.8.13 allows attackers controlling a subordinate Certificate Authority to bypass cross-domain PKI restrictions and issue unauthorized certificates.","summary":"Incomplete X.509 implementation in GnuTLS v3.8.13 allows attackers controlling a subordinate Certificate Authority to bypass cross-domain PKI restrictions and issue unauthorized certificates.","severity":"high","published":"2026-10-08","updated":"2026-10-08","sourceUpdated":"2026-10-08T21:33:42.423","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88648","references":[{"url":"https://gist.github.com/lkloliver/1f2a97cb8d0b31aa27b6bd0354358d7d","label":"cve@mitre.org"},{"url":"https://www.rfc-editor.org/rfc/rfc5280#section-4.2.1.10","label":"cve@mitre.org"},{"url":"https://www.rfc-editor.org/rfc/rfc5280#section-6.1.4","label":"cve@mitre.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88648.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-88648"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2548200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-88648"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88648"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"ingestedAt":"2026-10-08T20:06:22.191Z","epss":0.00203,"epssPercentile":0.10147,"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","hardened_images","openshift_container_platform 4"],"cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cvssSource":"vendor","cwe":["CWE-295"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-19T15:06:45.918878Z"},"scores":{"vendor":7.4,"adp":3.7},"slug":"CVE-2026-88648","body":"## Overview\n\nIncomplete X.509 implementation in GnuTLS v3.8.13 allows attackers controlling a subordinate Certificate Authority to bypass cross-domain PKI restrictions and issue unauthorized certificates.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images, … · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88648.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":223548,"id":"CVE-2026-88648","ts":1792238293598,"field":"cvss","old":null,"new":"7.4"},{"seq":223547,"id":"CVE-2026-88648","ts":1792238293598,"field":"severity","old":"none","new":"high"}]}