CVE Feed

    Dashboard / CVE / CVE-2026-89133

    CVE-2026-89133

    wolfSSL versions 5.9.2 and earlier contain a flaw in the X.509 certificate validation logic where it fails to properly enforce NameConstraints extensions when there is an unconstrained CA tier between a name-constrained intermediate CA and the leaf certificate. wolfSSL incorrectly accepted certificates for hostnames they shouldn't be allowed to cover, due to a chain-walking state-machine bug that resets the validation state when encountering an intermediate without NameConstraints, thereby bypassing cryptographic delegation controls. This defect exists in the default build configuration that makes use of certificates where name constraint extensions are used. Thanks to Jack Lloyd, PathDiff, and Ben Smyth for reporting the issue.

    Published:Sep 27, 2026
    Last Modified:Oct 2, 2026
    EPS:Sep 27, 2026
    EPSS Score:0.00146
    CVSS Score:5.3

    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-2026-89134 (CVSS 6.3) — A certificate with no dNSName SAN but another SAN type present (e.g. registeredID or iPAddress) bypassed the S…
    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
    CVE-2026-89133 — Wolfssl (Medium 6.3) | CVE-DB