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.
Published: 2026-06-08
Score: 6.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4653-1 openvpn security update
Debian DSA Debian DSA DSA-6289-1 openvpn security update
Ubuntu USN Ubuntu USN USN-8286-1 OpenVPN vulnerabilities
History

Tue, 16 Jun 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 08 Jun 2026 23:15:00 +0000

Type Values Removed Values Added
Title OpenVPN TLS Session Promotion Race Condition Causing Crash or Memory Leak

Mon, 08 Jun 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Openvpn
Openvpn openvpn
Vendors & Products Openvpn
Openvpn openvpn

Mon, 08 Jun 2026 20:45:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-125
CWE-416
References
Metrics cvssV4_0

{'score': 6.1, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: OpenVPN

Published:

Updated: 2026-06-16T12:24:37.681Z

Reserved: 2026-04-13T10:28:10.354Z

Link: CVE-2026-40215

cve-icon Vulnrichment

Updated: 2026-06-16T12:24:33.467Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-06-08T21:16:45.453

Modified: 2026-06-09T02:08:28.150

Link: CVE-2026-40215

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-08T23:00:17Z

Weaknesses