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[USN-8286-1] OpenVPN vulnerabilities

Posted on 20 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8286-1
May 20, 2026

openvpn vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

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)

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.

References:
https://ubuntu.com/security/notices/USN-8286-1
CVE-2026-35058, CVE-2026-40215

Package Information:
https://launchpad.net/ubuntu/+source/openvpn/2.7.0-1ubuntu1.1
https://launchpad.net/ubuntu/+source/openvpn/2.6.19-0ubuntu0.25.10.2
https://launchpad.net/ubuntu/+source/openvpn/2.6.19-0ubuntu0.24.04.2
https://launchpad.net/ubuntu/+source/openvpn/2.5.11-0ubuntu0.22.04.3

--===============8858517387936049103==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

 

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