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CVE-2026-89134Subject CN name-constraint check bypassed when non-DNS SAN present
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.
6.3 MEDIUMEPSS 0.17%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.3 | MEDIUM | 4.0wolfSSL (CNA) | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| 9.1 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
Details
- CVE ID
- CVE-2026-89134
- Status
- Analyzed
- Assigner (CNA)
- wolfSSL
- Published
- Sep 27, 2026
- Last modified
- 2026-10-02 18:57 UTC
- Weaknesses
- CWE-295 · Improper Certificate Validation
Affected Products
As published by the CNA in the CVE record.
wolfSSLwolfSSL1 version range
- 5.9.2