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[USN-8407-1] strongSwan vulnerability

Posted on 08 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8407-1
June 08, 2026

strongswan vulnerability
==========================================================================
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:

strongSwan could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- strongswan: IPsec VPN solution

Details:

Elliott Childre discovered that strongSwan incorrectly handled the cloning
of certain identities. A remote attacker could use this issue to cause
strongSwan to crash, resulting in a denial of service, or possibly execute
arbitrary code.

Update instructions:

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

Ubuntu 26.04 LTS
libstrongswan 6.0.4-1ubuntu3.1
strongswan 6.0.4-1ubuntu3.1

Ubuntu 25.10
libstrongswan 6.0.1-6ubuntu4.4
strongswan 6.0.1-6ubuntu4.4

Ubuntu 24.04 LTS
libstrongswan 5.9.13-2ubuntu4.24.04.4
strongswan 5.9.13-2ubuntu4.24.04.4

Ubuntu 22.04 LTS
libstrongswan 5.9.5-2ubuntu2.7
strongswan 5.9.5-2ubuntu2.7

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

References:
https://ubuntu.com/security/notices/USN-8407-1
CVE-2026-47895

Package Information:
https://launchpad.net/ubuntu/+source/strongswan/6.0.4-1ubuntu3.1
https://launchpad.net/ubuntu/+source/strongswan/6.0.1-6ubuntu4.4
https://launchpad.net/ubuntu/+source/strongswan/5.9.13-2ubuntu4.24.04.4
https://launchpad.net/ubuntu/+source/strongswan/5.9.5-2ubuntu2.7

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