CVE-2026-40215

6.1MEDIUM

Key Information:

Vendor

Openvpn
Status
Openvpn
Vendor
CVE Published:
8 June 2026

What is CVE-2026-40215?

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 Version(s)

OpenVPN 2.6.0 <= 2.6.19

OpenVPN 2.7_alpha1 <= 2.7.1

References

https://community.openvpn.net/Security%20Announcements/CV...
vendor-advisory
https://community.openvpn.net/ReleaseHistory#openvpn-272-...
release-notes
https://community.openvpn.net/ReleaseHistory#openvpn-2620...
release-notes

CVSS V4

Score:
6.1
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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