---
id: CVE-2026-89136
title: >-
  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
summary: >-
  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 …
severity: high
cvss: 8.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-287
vendor: wolfSSL
product: wolfSSL
affected:
  - wolfSSL >= 5.6.0 <= 5.9.2
published: '2026-09-27'
updated: '2026-09-27'
sourceUpdated: '2026-09-27T10:16:59.287'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89136'
references:
  - url: 'https://github.com/wolfSSL/wolfssl/pull/11009'
    label: facts@wolfssl.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-27T09:45:46.032Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.