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[USN-8117-1] strongSwan vulnerability

Posted on 23 March 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8117-1
March 23, 2026

strongswan vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

strongSwan could be made to consume resources or crash if it received
specially crafted network traffic.

Software Description:
- strongswan: IPsec VPN solution

Details:

Kazuma Matsumoto discovered that strongSwan incorrectly handled EAP-TTLS
AVPs when using the eap-ttls plugin. An attacker could possibly use this
issue to cause strongSwan to consume resources and crash, resulting in a
denial of service.

Update instructions:

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

Ubuntu 25.10
libstrongswan 6.0.1-6ubuntu4.2
strongswan 6.0.1-6ubuntu4.2

Ubuntu 24.04 LTS
libstrongswan 5.9.13-2ubuntu4.24.04.2
strongswan 5.9.13-2ubuntu4.24.04.2

Ubuntu 22.04 LTS
libstrongswan 5.9.5-2ubuntu2.5
strongswan 5.9.5-2ubuntu2.5

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

References:
https://ubuntu.com/security/notices/USN-8117-1
CVE-2026-25075

Package Information:
https://launchpad.net/ubuntu/+source/strongswan/6.0.1-6ubuntu4.2
https://launchpad.net/ubuntu/+source/strongswan/5.9.13-2ubuntu4.24.04.2
https://launchpad.net/ubuntu/+source/strongswan/5.9.5-2ubuntu2.5

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