CVE-2026-5501

Name of the Vulnerable Software and Affected Versions wolfSSL versions prior to 5.9.1

Description The wolfSSL X509 verify cert function within the OpenSSL compatibility layer does not properly check the signature of a certificate's leaf when an untrusted intermediate certificate with Basic Constraints CA:FALSE signed by a trusted root is provided. This allows an attacker with a valid certificate from a trusted Certificate Authority (CA), such as Let's Encrypt, to forge a certificate for any subject name and public key.

Recommendations Update to version 5.9.1 or later.