CVE-2026-88648

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "cveTags": [{"sourceIdentifier": "cve@mitre.org", "tags": ["disputed"]}], "descriptions": [{"lang": "en", "value": "In GnuTLS v3.8.13, an excluded msUPN/SRV otherName is never checked. NOTE: the Supplier does not consider this an actionable security vulnerability because of its \"threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)\" policy."}], "id": "CVE-2026-88648", "lastModified": "2026-11-04T05:19:05.203", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-88648", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-19T15:06:45.918878Z", "version": "2.0.3"}}]}, "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://gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f/SECURITY.md"}, {"source": "cve@mitre.org", "url": "https://gitlab.com/gnutls/gnutls/-/work_items/1965"}, {"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"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://github.com/lkloliver/poc/tree/main/CVE-2026-88648"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"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"}

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