Description
Improper certificate validation in the OpenVPN 3 Core library version 3.4 through 3.11.7 allows attackers to circumvent extended key usage restrictions.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenVPN | OpenVPN 3 Core Library | 3.4 – ≤ 3.11.7 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openvpn3-client | No fix yet | — |
| Debian 13 | openvpn3-client | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | openvpn | No fix yet | — |
| Ubuntu 26.04 LTS | openvpn | No fix yet | — |
| Ubuntu 24.04 LTS | openvpn | No fix yet | — |
| Ubuntu 22.04 LTS | openvpn | No fix yet | — |
| Ubuntu 20.04 LTS | openvpn | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | openvpn | No fix yet | — |
| Ubuntu Pro 16.04 LTS | openvpn | No fix yet | — |
| Ubuntu Pro 14.04 LTS | openvpn | No fix yet | — |
Advisories 1
- WID-SEC-2026-4127 OpenVPN 3 Core Library: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Oct 22, 2026