CVE-2026-45389_CVE-2026-45389

{
    "lastseen": "",
    "description": "In OCaml-TLS before 2.1.0, the server implementation does insufficient checks of the certificate provided by the client (when doing client authentication), which allows impersonation with certificates that are not meant for client authentication (because of KeyUsage and ExtendedKeyUsage).",
    "published": "2026-06-15T00:00:00.000Z",
    "modified": "2026-06-16T13:56:44.473Z",
    "type": "cve",
    "title": "CVE-2026-45389",
    "source": "mitre",
    "references": "https://osv.dev/vulnerability/OSEC-2026-07",
    "id": "CVE-2026-45389",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "n/a n/a n/a",
    "sourceHref": "",
    "cvss": {
        "score": 9.1,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "OCaml-TLS",
    "version": "before 2.1.0",
    "vendor": "OCaml",
    "ai_description": "Insufficient certificate checks allow impersonation with non-client authentication certificates",
    "ai_severity": "Critical",
    "ai_vendor": "OCaml",
    "ai_product": "OCaml-TLS",
    "ai_version": "before 2.1.0",
    "ai_score": 9.1
}