CVE-2025-11936: wolfSSL

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.

Affected products

• wolfSSL wolfSSL: from 5.8.2, before 5.8.4 (fixed in 5.8.4)

Published 2025-11-21. Last modified 2026-06-17.