{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-88648", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-10-08T18:53:34.175Z", "dateReserved": "2026-09-10T00:00:00.000Z", "datePublished": "2026-10-08T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-10-08T18:53:34.175Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://www.rfc-editor.org/rfc/rfc5280#section-4.2.1.10"}, {"url": "https://www.rfc-editor.org/rfc/rfc5280#section-6.1.4"}, {"url": "https://gist.github.com/lkloliver/1f2a97cb8d0b31aa27b6bd0354358d7d"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}}, "dataVersion": "5.2"}

{}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-88648", "lastModified": "2026-10-08T21:33:42.423", "metrics": {}, "published": "2026-10-08T19:20:52.703", "references": [{"source": "cve@mitre.org", "url": "https://gist.github.com/lkloliver/1f2a97cb8d0b31aa27b6bd0354358d7d"}, {"source": "cve@mitre.org", "url": "https://www.rfc-editor.org/rfc/rfc5280#section-4.2.1.10"}, {"source": "cve@mitre.org", "url": "https://www.rfc-editor.org/rfc/rfc5280#section-6.1.4"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "gnutls: gnutls: Cross-domain certificate restriction bypass via incomplete X.509 validation", "id": "2548200", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2548200"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-295", "details": ["A flaw was found in GnuTLS. An attacker controlling a subordinate Certificate Authority (CA) can exploit an incomplete X.509 certificate validation mechanism to bypass cross-domain Public Key Infrastructure (PKI) restrictions. This allows unauthorized certificates to be accepted as valid, potentially enabling the attacker to impersonate trusted domains and intercept secure communications."], "name": "CVE-2026-88648", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "gnutls", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "gnutls", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "gnutls", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "gnutls", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "gnutls", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "gnutls", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88648\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88648\nhttps://gist.github.com/lkloliver/1f2a97cb8d0b31aa27b6bd0354358d7d\nhttps://www.rfc-editor.org/rfc/rfc5280#section-4.2.1.10\nhttps://www.rfc-editor.org/rfc/rfc5280#section-6.1.4"], "threat_severity": "Important"}

{"created": "2026-10-08T21:45:16.699841+00:00", "title": "Cross\u2011Domain PKI Bypass via Incomplete X.509 Implementation", "updated": "2026-10-08T21:45:16.699847+00:00", "vendors": [], "weaknesses": ["CWE-640", "CWE-284"]}