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    CVE-2026-89134

    A certificate with no dNSName SAN but another SAN type present (e.g. registeredID or iPAddress) bypassed the Subject CN dNSName name-constraint check. The CN-as-DNS fallback was gated on cert->subjectCN != NULL && cert->altNames == NULL && !cert->isCA instead of "no dNSName SAN", so an out-of-scope CN was accepted. This incomplete fix from CVE-2026-6731, leading to the name-constraint check issue, was introduced in wolfSSL version 5.9.2.

    Published:Sep 27, 2026
    Last Modified:Oct 2, 2026
    EPS:Sep 27, 2026
    EPSS Score:0.0014
    CVSS Score:9.1

    Affected Products

    Vendor
    Wolfssl
    Product
    Wolfssl

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

    CVE-2026-95208 (CVSS 7.5) — An issue in the ConfirmNameConstraints() function (wolfcrypt/src/asn.c) of wolfSSL v5.9.1 and v5.9.2 allows at…
    CVE-2026-15442 (CVSS 2.3) — In all builds that make use of (D)TLS, including default builds, there is a series of conditional states durin…
    CVE-2026-89102 (CVSS 8.3) — In wolfSSL versions 5.7.2 through 5.9.2 there is a client-side implementation flaw in RFC 6961, multiple OCSP …
    CVE-2026-89133 (CVSS 6.3) — wolfSSL versions 5.9.2 and earlier contain a flaw in the X.509 certificate validation logic where it fails to …
    CVE-2026-89135 (CVSS 6.3) — A failed X509_verify_cert call permanently plants an unverified attacker CA in the shared CertManager, bypassi…
    CVE-2026-89136 (CVSS 8.3) — When using RPK (Raw Public Key), the client side of a TLS 1.2, 1.3 and DTLS 1.2 connection could accept an uns…
    CVE-2026-93302 (CVSS 8.3) — MatchTrustedPeer ignores the public key used, leading to forged CA clones passing verification. Affected build…
    CVE-2026-93304 (CVSS 6.3) — A (D)TLS 1.2 client can accept a ChangeCipherSpec message before it has sent its ClientKeyExchange. No master …
    CVE-2026-94417 (CVSS 2.3) — When an application enables both OCSP and CRL revocation checking on one WOLFSSL_CTX or certificate manager, w…
    CVE-2026-94418 (CVSS 2.3) — Under WOLFSSL_SMALL_CERT_VERIFY, ProcessPeerCertParse() runs the certificate signature check separately from t…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High