Name: CVE-2026-40215: Out-of-bounds Read
Creator: Rapid7
Published: 2026-06-08T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-40215, CWE-125, CWE-416, CVSS 7.4, EPSS 0.00591

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.

CVSS Details

CVSS 4.0 Base Score: 6.1 (MEDIUM)
CVSS 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 7.4
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alpine Linux	—	Upgrade openvpn	Jun 9, 2026	Jun 8, 2026
Amazon_linux_2023	—	Upgrade openvpn-debuginfoUpgrade openvpn-debugsourceUpgrade openvpnUpgrade openvpn-devel	Jul 14, 2026	Jun 8, 2026
Debian	—	Upgrade openvpn	May 24, 2026	May 24, 2026
Freebsd	—	Upgrade openvpn	Apr 27, 2026	Apr 22, 2026
Ubuntu	—	Upgrade openvpn	May 25, 2026	May 20, 2026

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CVSS Details

Covered by Rapid7

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