--- title: "CVE-2026-89134: wolfSSL - Authentication Bypass" description: "wolfSSL 5.9.2 contains a broken authentication caused by improper name-constraint checks allowing certificates with no dNSName SAN but other SAN types to bypass Subject CN dNSName validation, letting attackers bypass name constraints, exploit requires crafted certificate." url: https://panop.io/threat-heartbeat/CVE-2026-89134/ --- # CVE-2026-89134 wolfSSL - Authentication Bypass wolfSSL 5.9.2 contains a broken authentication caused by improper name-constraint checks allowing certificates with no dNSName SAN but other SAN types to bypass Subject CN dNSName validation, letting attackers bypass name constraints, exploit requires crafted certificate. CVSS base score 9.1 /10 Critical CISA KEV Not listed Public exploit None known EPSS 0.16% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89134) ## Details Type Authentication Bypass Impact Broken Authentication CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Published 27 September 2026 Updated 15 October 2026 Weakness [CWE-295](https://cwe.mitre.org/data/definitions/295.html) ## Vendor fix Update to a version later than 5.9.2 or the latest available version. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-89134](https://nvd.nist.gov/vuln/detail/CVE-2026-89134) - [https://github.com/wolfSSL/wolfssl/pull/10837](https://github.com/wolfSSL/wolfssl/pull/10837) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)