Vulnerability · Published Jun 8, 2026 · Assigned by OpenVPN
CVE-2026-40215
Medium 6.1
In plain English
A medium-severity out-of-bounds read in OpenVPN from OpenVPN. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)6.1Medium
Exploit odds (30 days)0.4%top 68.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | openvpn | 2.6.20-r0 | ALPINE-CVE-2026-40215 |
| Alpine:v3.21 | openvpn | 2.6.20-r0 | ALPINE-CVE-2026-40215 |
| Alpine:v3.22 | openvpn | 2.6.20-r0 | ALPINE-CVE-2026-40215 |
| Alpine:v3.23 | openvpn | 2.6.20-r0 | ALPINE-CVE-2026-40215 |
| Alpine:v3.24 | openvpn | 2.6.20-r0 | ALPINE-CVE-2026-40215 |
| Debian:12 | openvpn | 2.6.14-0+deb12u1 | DEBIAN-CVE-2026-40215 |
| Debian:13 | openvpn | 2.6.14-1+deb13u2 | DEBIAN-CVE-2026-40215 |
| Debian:14 | openvpn | 2.7.2-1 | DEBIAN-CVE-2026-40215 |
| Ubuntu:22.04:LTS | openvpn | 2.5.11-0ubuntu0.22.04.3 | UBUNTU-CVE-2026-40215 |
| Ubuntu:24.04:LTS | openvpn | 2.6.19-0ubuntu0.24.04.2 | UBUNTU-CVE-2026-40215 |
| Ubuntu:25.10 | openvpn | 2.6.19-0ubuntu0.25.10.2 | UBUNTU-CVE-2026-40215 |
| Ubuntu:26.04:LTS | openvpn | 2.7.0-1ubuntu1.1 | UBUNTU-CVE-2026-40215 |
Affected products (as reported)
Weakness: CWE-125, CWE-416 · 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