CRITICALVulnerability
Verified
Global

NVD CRITICAL: CVE-2026-89134 — A certificate with no dNSName SAN but another SAN type present (e.g. registeredI...

·Source: NIST NVD

Updated:

Executive Summary

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,

Analysis

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. CVSS Score: 9.1. Published: 2026-09-27T10:16:59.030.

Indicators of Compromise (2)

CVE (2)
CVE-2026-6731
NVDMITRE CVE
CVE-2026-89134
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Sep 27, 2026. Verified by: NIST.

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