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CVE-2026-89134

9.1, critical

A certificate with no dNSName SAN but another SAN type present (e.g

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.1, critical critical CVSS v3.1
EPSS, next 30 days
0.2% higher than 4.3% of scored CVEs
Exploitation
No public evidence
Published
27 Sept 202620 days ago

Description

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.

Details

Vendor
wolfSSL
Product
wolfSSL
Weakness
CWE-295 (opens in a new tab)
Status
Analyzed
Updated
2 Oct 2026
Assigner
facts@wolfssl.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References 1

Patches and fixes 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other wolfSSL CVEs

Every wolfSSL CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-83540 wolfSSL wolfSSH Improper Authentication Vulnerability EPSS 0.4% 8.8, high
  • CVE-2026-94418 Under WOLFSSL_SMALL_CERT_VERIFY, ProcessPeerCertParse() runs the certificate signature check separately from the parse to keep peak… EPSS <0.1% 7.5, high
  • CVE-2026-93302 MatchTrustedPeer ignores the public key used, leading to forged CA clones passing verification EPSS 0.2% 8.2, high

Beyond this page

Is CVE-2026-89134 in your network?

This page tells you how dangerous CVE-2026-89134 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-89134 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 16 Oct 2026, not the live upstream state.