CVE-2026-89134CWE-295

CVE-2026-89134

Critical · published September 27, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
4.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
6.3 · 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
EPSS
0.00157 · 4.4th percentile
Weakness
CWE-295 · Improper Certificate Validation
Published
2026-09-27T14:16Z
Affected products (1)
ProductVersionsFixed in
wolfssl/wolfsslall versions—
References (1)
https://github.com/wolfSSL/wolfssl/pull/10837 · [email protected]
EPSS history
Timeline
  • 28 SEP 03:29Z
    EPSS moved — → 0%
    epss
  • 27 SEP 09:16Z
    Subject CN name-constraint check bypassed when non-DNS SAN present
    cvelistv5