CVE-2026-40215

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-08 · updated 2026-08-11
Weakness: CWE-125

Description

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: from 2.6.0 before 2.6.20; from 2.7 before 2.7.2 — fixed in 2.6.20, 2.7.2

How to fix

Upgrade to a fixed version: OpenVPN 2.6.20, 2.7.2. Check the vendor advisory for mitigations.

References

https://community.openvpn.net/ReleaseHistory#openvpn-2620-released-22-april-2026
https://community.openvpn.net/ReleaseHistory#openvpn-272-released-22-april-2026
https://community.openvpn.net/Security%20Announcements/CVE-2026-40215

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