Ubuntu 26.04 OpenVPN Suffers Moderate Denial of Service Vulnerabilities

ubuntu

May 20, 2026

Several security issues were fixed in OpenVPN.

Summary

Several security issues were fixed in OpenVPN.

Software Description:

- openvpn: virtual private network software

Details:

Guannan Wang, Zhanpeng Liu, Guancheng Li, and Emma Reuter

discovered that OpenVPN incorrectly handled suitably malformed

packets with valid tls-crypt-v2 keys. An attacker could possibly use

this issue to cause OpenVPN to crash, resulting in a denial of

service. (CVE-2026-35058)

Guannan Wang, Zhanpeng Liu, and Guancheng Li discovered that

OpenVPN had a race condition in the TLS handshake process that could

leak packet data from a previous handshake under certain

circumstances. An attacker could possibly use this issue to obtain

sensitive information. (CVE-2026-40215)

Topics Covered

security advisory moderate denial of service information leak Ubuntu openvpn

Update Instructions

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

Ubuntu 26.04 LTS
  openvpn                         2.7.0-1ubuntu1.1

Ubuntu 25.10
  openvpn                         2.6.19-0ubuntu0.25.10.2

Ubuntu 24.04 LTS
  openvpn                         2.6.19-0ubuntu0.24.04.2

Ubuntu 22.04 LTS
  openvpn                         2.5.11-0ubuntu0.22.04.3

In general, a standard system update will make all the necessary changes.