Client accepts unsolicited RawPublicKey server certificate type

When using RPK (Raw Public Key), the client side of a TLS 1.2, 1.3 and DTLS 1.2 connection could accept an unsolicited server_cert_type=RawPublicKey which allowed a malicious or misbehaving server to bypass authentication. RPK is off by default and only enabled in --enable-rpk OR --enable-all OR --enable-distro AKA HAVE_RPK builds.

Problem type

CWE-287 Improper Authentication

Affected products

wolfSSL

wolfSSL

<= 5.9.2 - AFFECTED

References

github.com

https://github.com/wolfSSL/wolfssl/pull/11009

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-89136

Click to expand

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-89136",
    "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
    "assignerShortName": "wolfSSL",
    "dateUpdated": "2026-09-27T09:13:14.003Z",
    "dateReserved": "2026-09-10T22:38:50.530Z",
    "datePublished": "2026-09-27T09:12:39.137Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
        "shortName": "wolfSSL",
        "dateUpdated": "2026-09-27T09:13:14.003Z"
      },
      "datePublic": "2026-09-26T12:00:00.000Z",
      "title": "Client accepts unsolicited RawPublicKey server certificate type",
      "descriptions": [
        {
          "lang": "en",
          "value": "When using RPK (Raw Public Key), the client side of a TLS 1.2, 1.3 and DTLS 1.2 connection could accept an unsolicited server_cert_type=RawPublicKey which allowed a malicious or misbehaving server to bypass authentication. RPK is off by default and only enabled in --enable-rpk OR --enable-all OR --enable-distro AKA HAVE_RPK builds.",
          "supportingMedia": [
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              "type": "text/html",
              "base64": false,
              "value": "When using RPK (Raw Public Key), the client side of a TLS 1.2, 1.3 and DTLS 1.2 connection could accept an unsolicited server_cert_type=RawPublicKey which allowed a malicious or misbehaving server to bypass authentication. RPK is off by default and only enabled in --enable-rpk OR --enable-all OR --enable-distro AKA HAVE_RPK builds."
            }
          ]
        }
      ],
      "affected": [
        {
          "vendor": "wolfSSL",
          "product": "wolfSSL",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "5.6.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "5.9.2"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-287 Improper Authentication",
              "cweId": "CWE-287",
              "type": "CWE"
            }
          ]
        }
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      "references": [
        {
          "url": "https://github.com/wolfSSL/wolfssl/pull/11009"
        }
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      "metrics": [
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          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
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      "credits": [
        {
          "lang": "en",
          "value": "Christos Papakonstantinou (Cantina Security)",
          "type": "finder"
        }
      ]
    }
  }
}