A vulnerability (CVE-2026-47895) in strongSwan's handling of identity cloning allows a remote attacker to cause a denial-of-service crash or potentially execute arbitrary code via specially crafted network traffic. The flaw affects multiple Ubuntu LTS releases, including 22.04 LTS, 24.04 LTS, 25.10, and 26.04 LTS. The issue is corrected by updating to the specific package versions listed in the notice, such as `strongswan 6.0.4-1ubuntu3.1` for Ubuntu 26.04 LTS.
Ubuntu Security Notices USN-8407-1 USN-8407-1: strongSwan vulnerability Publication date 8 June 2026 Overview strongSwan could be made to crash or run programs if it received specially crafted network traffic. Releases 26.04 LTS 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 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. 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 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 26.04 LTS resolute libstrongswan – 6.0.4-1ubuntu3.1 strongswan – 6.0.4-1ubuntu3.1 25.10 questing libstrongswan – 6.0.1-6ubuntu4.4 strongswan – 6.0.1-6ubuntu4.4 24.04 LTS noble libstrongswan – 5.9.13-2ubuntu4.24.04.4 strongswan – 5.9.13-2ubuntu4.24.04.4 22.04 LTS jammy libstrongswan – 5.9.5-2ubuntu2.7 strongswan – 5.9.5-2ubuntu2.7 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-2026-47895 CVE-2026-47895