Back Linuxsecurity

Ubuntu OpenVPN Update Blocks Certificate

Linuxsecurity •LinuxSecurity Advisories • October 22, 2026

Running self-managed GitLab? Critical flaws could allow server code execution. Check the fixes. ×

OpenVPN could allow unintended access to network services. Software Description: - openvpn: virtual private network software Details: It was discovered that OpenVPN incorrectly handled certificate subject fields. A remote authenticated user could possibly use this issue to impersonate other users.

OpenVPN could allow unintended access to network services.

Software Description:

- openvpn: virtual private network software

It was discovered that OpenVPN incorrectly handled certificate subject

fields. A remote authenticated user could possibly use this issue to

impersonate other users.

The problem can be corrected by updating your system to the following package versions: Ubuntu 26.10 openvpn 2.7.7-1ubuntu1.1 Ubuntu 26.04 LTS openvpn 2.7.0-1ubuntu1.4 Ubuntu 24.04 LTS openvpn 2.6.19-0ubuntu0.24.04.5 Ubuntu 22.04 LTS openvpn 2.5.11-0ubuntu0.22.04.6 After a standard system update you need to restart OpenVPN to make all the necessary changes.

Ubuntu Security Notice USN-8953-1

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Linux Security - Your source for Top Linux News, Advisories, HOWTOs and Feature Releases

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

OpenVPN Vulnerability Allows User Impersonation in Ubuntu A vulnerability in OpenVPN has been identified, where it improperly handles certificate subject fields. This flaw could allow a remote authenticated user to impersonate other users, potentially leading to unauthorized access to network services. The issue affects multiple Ubuntu versions, including 26.10, 26.04 LTS, 24.04 LTS, and 22.04 LTS. Users are advised to update to the latest package versions to mitigate the risk. After applying the updates, a restart of OpenVPN is required to implement the changes. The vulnerability has been documented as USN-8953-1 by Ubuntu, and it is crucial for users to take immediate action to secure their systems. 2 sources 46

Extracted Entities

Ubuntu OpenVPN Update Blocks Certificate

The full story

Extracted Entities

Attack Types (1)

Companies (1)

CWE Weaknesses (1)

Platforms (1)