CVE-2026-94418 WolfSSL - Authentication Bypass

WolfSSL with WOLFSSL_SMALL_CERT_VERIFY enabled contains a broken authentication caused by improper merging of certificate signature check results, letting attackers with crafted certificates bypass signature validation, exploit requires a verify callback that overrides date errors.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.09% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication, Man In The Middle
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
27 September 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Disable WOLFSSL_SMALL_CERT_VERIFY or update to a version where signature check merging is fixed; avoid using verify callbacks that override date errors.

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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