CVE-2026-89134
Subject CN name-constraint check bypassed when non-DNS SAN present
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-295 |
| Vendor | wolfssl |
| Product | wolfssl |
| Published | Sep 27, 2026 |
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Affected Versions
wolfSSL / wolfSSL
5.9.2
Credits
Jorge Milla (Pig-Tail)