CVE-2026-5447: wolfSSL

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Heap buffer overflow in CertFromX509 via AuthorityKeyIdentifier size confusion. A heap buffer overflow occurs when converting an X.509 certificate internally due to incorrect size handling of the AuthorityKeyIdentifier extension.

Affected products

• wolfSSL wolfSSL: before 5.9.1 (fixed in 5.9.1)

Published 2026-04-09. Last modified 2026-06-17.