USN-7898-1: OpenVPN vulnerability

Publication date

27 November 2025

Overview

OpenVPN could allow unintended access to network services.


Packages

  • openvpn - virtual private network software

Details

Joshua Rogers discovered that OpenVPN incorrectly handled HMAC verification
checks. A remote attacker could possibly use this issue to bypass source IP
address validation.

Joshua Rogers discovered that OpenVPN incorrectly handled HMAC verification
checks. A remote attacker could possibly use this issue to bypass source IP
address validation.

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
25.10 questing openvpn –  2.6.14-2ubuntu1.1
25.04 plucky openvpn –  2.6.14-0ubuntu0.25.04.3
24.04 LTS noble openvpn –  2.6.14-0ubuntu0.24.04.3

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.


Have additional questions?

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