What is CVE-2026-40215?

CVE-2026-40215 is a high-severity vulnerability in Openvpn, classified under Out-of-bounds Read. CVSS score: 7.4/10. Published 2026-06-08.

How severe is CVE-2026-40215?

High severity. CVSS v3 base score is 7.4 out of 10.

Out-of-bounds Read in Openvpn

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.

Vulnerability class: Buffer Overflow

EPSS: 0.004 (30.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Openvpn — versions 2.6.0, 2.7_alpha1

Weakness classification (CWE)

References

security@openvpn.net (release-notes, Release Notes)
security@openvpn.net (release-notes, Release Notes)
security@openvpn.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40215?: CVE-2026-40215 is a high-severity vulnerability in Openvpn, classified under Out-of-bounds Read. CVSS score: 7.4/10. Published 2026-06-08.
How severe is CVE-2026-40215?: High severity. CVSS v3 base score is 7.4 out of 10.