# CVE-2026-40215: openvpn: 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...

CVE-2026-40215 is fixed in 5 products on 1 platform, first by openvpn 2.5.11-0ubuntu0.22.04.3, released April 22, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-40215
- Priority: High
- CVSS: 7.4 (high)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 22, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | openvpn Debian 12.15 (bookworm) | 2.6.14-0+deb12u1 | [DEBIAN-CVE-2026-40215](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40215.md) | May 15, 2026 |
| Linux | openvpn Debian 13.5 (trixie) | 2.6.14-1+deb13u2 | [DEBIAN-CVE-2026-40215](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40215.md) | May 15, 2026 |
| Linux | openvpn Debian 14 | 2.7.2-1 | [DEBIAN-CVE-2026-40215](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40215.md) | May 15, 2026 |
| Linux | openvpn Ubuntu 22.04.1 LTS (jammy) | 2.5.11-0ubuntu0.22.04.3 | [openvpn 2.5.11-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-openvpn-2.5.11-0ubuntu0.22.04.3.md) | Apr 22, 2026 |
| Linux | openvpn Ubuntu 24.04.5 LTS (noble) | 2.6.19-0ubuntu0.24.04.2 | [openvpn 2.6.19-0ubuntu0.24.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-openvpn-2.6.19-0ubuntu0.24.04.2.md) | Apr 22, 2026 |
| Linux | openvpn Ubuntu 25.10 (questing) | 2.6.19-0ubuntu0.25.10.2 | [openvpn 2.6.19-0ubuntu0.25.10.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-openvpn-2.6.19-0ubuntu0.25.10.2.md) | Apr 22, 2026 |
| Linux | openvpn Ubuntu 26.04.1 LTS (resolute) | 2.7.0-1ubuntu1.1 | [openvpn 2.7.0-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openvpn-2.7.0-1ubuntu1.1.md) | Apr 22, 2026 |
| Linux | openvpn amzn 2023 | 2.6.12-1.amzn2023.0.4 | [ALAS2023-2026-1644](https://patchblox.com/security/data/fix/linux/alas2023-2026-1644.md) | May 11, 2026 |
| Linux | openvpn opensuse-leap 16.0 | 2.6.10-160000.5.1 | [OPENSUSE-SU-2026:22072-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22072-1.md) | Nov 7, 2026 |
| Linux | openvpn sles 15.6 | 2.6.10-150600.3.26.1 | [SUSE-SU-2026:3596-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3596-1.md) | Aug 12, 2026 |
| Linux | openvpn sles 15.7 | 2.6.10-150600.3.26.1 | [SUSE-SU-2026:3596-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3596-1.md) | Aug 12, 2026 |
| Linux | openvpn sles 16.0 | 2.6.10-160000.5.1 | [SUSE-SU-2026:24220-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24220-1.md) | Nov 7, 2026 |
| Linux | openvpn-dco sles 15.6 | 2.6.10-150600.3.26.1 | [SUSE-SU-2026:3596-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3596-1.md) | Aug 12, 2026 |
| Linux | openvpn-dco sles 15.7 | 2.6.10-150600.3.26.1 | [SUSE-SU-2026:3596-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3596-1.md) | Aug 12, 2026 |
| Linux | openvpn-debuginfo amzn 2023 | 2.6.12-1.amzn2023.0.4 | [ALAS2023-2026-1644](https://patchblox.com/security/data/fix/linux/alas2023-2026-1644.md) | May 11, 2026 |
| Linux | openvpn-debugsource amzn 2023 | 2.6.12-1.amzn2023.0.4 | [ALAS2023-2026-1644](https://patchblox.com/security/data/fix/linux/alas2023-2026-1644.md) | May 11, 2026 |
| Linux | openvpn-devel amzn 2023 | 2.6.12-1.amzn2023.0.4 | [ALAS2023-2026-1644](https://patchblox.com/security/data/fix/linux/alas2023-2026-1644.md) | May 11, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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