USN-8117-1: strongSwan vulnerability

Publication date

23 March 2026

Overview

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


Packages

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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
25.10 questing libstrongswan –  6.0.1-6ubuntu4.2
strongswan –  6.0.1-6ubuntu4.2
24.04 LTS noble libstrongswan –  5.9.13-2ubuntu4.24.04.2
strongswan –  5.9.13-2ubuntu4.24.04.2
22.04 LTS jammy libstrongswan –  5.9.5-2ubuntu2.5
strongswan –  5.9.5-2ubuntu2.5

Reduce your security exposure

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Have additional questions?

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