Ubuntu Security Notices USN-8117-1 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. Releases 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages 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. 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 Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-25075 CVE-2026-25075