CVE-2026-40215

State: Published
Severity: 6.1 Medium
Published: Jun 8, 2026
Updated: Jun 16, 2026
Reserved: Apr 13, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.1 Medium	CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:L/SI:N/SA:L	OpenVPN

Weaknesses

CWE-125 Out-of-bounds read
CWE-416 Use after free

Affected Products

Product	Versions
OpenVPNOpenVPN	2.6.0 through 2.6.19Affected 2.7_alpha1 through 2.7.1Affected

References

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

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.