[USN-8196-1] strongSwan vulnerabilities

========================================================================== Ubuntu Security Notice USN-8196-1 April 22, 2026 strongswan vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in strongSwan. Software Description: - strongswan: IPsec VPN solution Details: Haruto Kimura discovered that strongSwan incorrectly handled the supported_versions extension in TLS. A remote attacker could possibly use this issue to cause strongSwan to stop responding, resulting in a denial of service. (CVE-2026-35328) Haruto Kimura discovered that strongSwan incorrectly handled certain encrypted PKCS#7 containers. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-35329) Lukas Johannes Moeller discovered that strongSwan incorrectly handled certain EAP-SIM/AKA attributes. A remote attacker could use this issue to cause strongSwan to stop responding, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-35330) Haruto Kimura discovered that strongSwan incorrectly handled processing of X.509 name constraints. A remote attacker could possibly use this issue to bypass excluded name constraints. (CVE-2026-35331) Haruto Kimura discovered that strongSwan incorrectly processed ECDH public values. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-35332) Lukas Johannes Moeller discovered that strongSwan incorrectly handled certain RADIUS attributes. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-35333) Ryo Shimada discovered that strongSwan incorrectly handled RSA decryption. A remote attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-35334) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 libstrongswan 6.0.1-6ubuntu4.3 strongswan 6.0.1-6ubuntu4.3 Ubuntu 24.04 LTS libstrongswan 5.9.13-2ubuntu4.24.04.3 strongswan 5.9.13-2ubuntu4.24.04.3 Ubuntu 22.04 LTS libstrongswan 5.9.5-2ubuntu2.6 strongswan 5.9.5-2ubuntu2.6 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8196-1 CVE-2026-35328, CVE-2026-35329, CVE-2026-35330, CVE-2026-35331, CVE-2026-35332, CVE-2026-35333, CVE-2026-35334 Package Information: https://launchpad.net/ubuntu/+source/strongswan/6.0.1-6ubuntu4.3 https://launchpad.net/ubuntu/+source/strongswan/5.9.13-2ubuntu4.24.04.3 https://launchpad.net/ubuntu/+source/strongswan/5.9.5-2ubuntu2.6