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[USN-8852-1] OpenVPN vulnerabilities

Posted on 30 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8852-1
September 30, 2026

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

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

Summary:

Several security issues were fixed in OpenVPN.

Software Description:
- openvpn: virtual private network software

Details:

It was discovered that OpenVPN had a use-after-free vulnerability in
its TLS session handling. An attacker could possibly use this issue
to cause OpenVPN to crash, resulting in a denial of service, or
execute arbitrary code. (CVE-2026-84471)

It was discovered that OpenVPN incorrectly handled retransmissions of
ACK packet IDs, which could trigger a timeout integer overflow. A
remote attacker could possibly use this issue to cause a denial of
service. (CVE-2026-84732)

Update instructions:

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

Ubuntu 26.04 LTS
openvpn 2.7.0-1ubuntu1.3

Ubuntu 24.04 LTS
openvpn 2.6.19-0ubuntu0.24.04.4

Ubuntu 22.04 LTS
openvpn 2.5.11-0ubuntu0.22.04.5

After a standard system update you need to restart OpenVPN to make
all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8852-1
CVE-2026-84471, CVE-2026-84732

Package Information:
https://launchpad.net/ubuntu/+source/openvpn/2.7.0-1ubuntu1.3
https://launchpad.net/ubuntu/+source/openvpn/2.6.19-0ubuntu0.24.04.4
https://launchpad.net/ubuntu/+source/openvpn/2.5.11-0ubuntu0.22.04.5

--===============2704636824053952385==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

 

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