CVE-2026-40215: Openvpn

High severity, CVSS 7.4. EPSS: 0.6% chance of exploitation in the next 30 days.

A race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.

Affected products

• Openvpn Openvpn: from 2.6.0, before 2.6.20 (fixed in 2.6.20); from 2.7, before 2.7.2 (fixed in 2.7.2)

Published 2026-06-08. Last modified 2026-08-11.