========================================================================== Ubuntu Security Notice USN-8196-2 April 27, 2026
strongswan vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: Summary: Several security issues were fixed in strongSwan. Software Description: Details: USN-8196-1 fixed vulnerabilities in strongSwan. This update provides the corresponding update to Ubuntu 26.04 LTS. Original advisory 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: In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8196-2 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
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