CVE-2026-89134 wolfSSL - Authentication Bypass

wolfSSL 5.9.2 contains a broken authentication caused by improper name-constraint checks allowing certificates with no dNSName SAN but other SAN types to bypass Subject CN dNSName validation, letting attackers bypass name constraints, exploit requires crafted certificate.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
27 September 2026
Updated
15 October 2026
Weakness
CWE-295

Vendor fix

Update to a version later than 5.9.2 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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