X.509 trust-chain bypass in wolfSSL_X509_verify_cert() via untrusted intermediate anchoring_CVE-2026-11310

{
    "lastseen": "",
    "description": "X.509 trust-chain bypass in the OpenSSL compatibility certificate verifier (wolfSSL_X509_verify_cert()). This affects only builds with --enable-opensslextra (OPENSSL_EXTRA) and whose application validates certificates by calling X509_verify_cert() with caller-supplied untrusted intermediate certificates; for those users it is critical, otherwise the library is unaffected. In particular, native wolfSSL TLS/DTLS usage is not impacted. wolfSSL's X509_verify_cert() temporarily loads each caller-supplied untrusted intermediate into the certificate manager but failed to drop them before the trusted-store check, so an untrusted intermediate could anchor the path itself. An attacker can present a chain that never reaches a configured trust anchor and have it accepted, resulting in acceptance of an attacker-controlled certificate. This is certificate verification independent of TLS (e.g. S/MIME/CMS, code/firmware signing, JWT/JWS x5c), is not specific to any key type or algorithm, and a single untrusted intermediate suffices. The default wolfSSL TLS handshake (WOLFSSL_VERIFY_PEER) is not affected; only TLS applications doing manual or deferred peer verification through this API are, which also requires --enable-sessioncerts.",
    "published": "2026-06-25T19:38:19.099Z",
    "modified": "2026-06-25T19:38:19.099Z",
    "type": "cve",
    "title": "X.509 trust-chain bypass in wolfSSL_X509_verify_cert() via untrusted intermediate anchoring",
    "source": "wolfSSL",
    "references": "https://github.com/wolfSSL/wolfssl/pull/10674\nhttps://www.wolfssl.com/docs/security-vulnerabilities/",
    "id": "CVE-2026-11310",
    "bulletinFamily": "",
    "cwe": [
        "CWE-295"
    ],
    "cvelist": null,
    "sourceData": "wolfSSL wolfSSL 5.8.4",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "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": "wolfSSL",
    "version": "5.8.4",
    "vendor": "wolfSSL",
    "ai_description": "X.509 trust-chain bypass vulnerability in wolfSSL_X509_verify_cert() function, allowing an attacker to present a chain that never reaches a configured trust anchor and have it accepted, resulting in acceptance of an attacker-controlled certificate.",
    "ai_severity": "High",
    "ai_vendor": "wolfSSL",
    "ai_product": "wolfSSL",
    "ai_version": "5.8.4",
    "ai_score": 8.7
}