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Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : strongSwan vulnerabilities (USN-8196-1)

high Nessus Plugin ID 309912

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8196-1 advisory.

 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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8196-1

Plugin Details

Severity: High

ID: 309912

File Name: ubuntu_USN-8196-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/23/2026

Updated: 4/23/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-35334

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:strongswan-scepclient, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libstrongswan, p-cpe:/a:canonical:ubuntu_linux:strongswan, p-cpe:/a:canonical:ubuntu_linux:strongswan-libcharon, p-cpe:/a:canonical:ubuntu_linux:libcharon-extauth-plugins, p-cpe:/a:canonical:ubuntu_linux:charon-systemd, p-cpe:/a:canonical:ubuntu_linux:strongswan-starter, p-cpe:/a:canonical:ubuntu_linux:libstrongswan-standard-plugins, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:strongswan-nm, p-cpe:/a:canonical:ubuntu_linux:strongswan-charon, p-cpe:/a:canonical:ubuntu_linux:strongswan-pki, p-cpe:/a:canonical:ubuntu_linux:strongswan-swanctl, p-cpe:/a:canonical:ubuntu_linux:libstrongswan-extra-plugins, p-cpe:/a:canonical:ubuntu_linux:libcharon-extra-plugins, p-cpe:/a:canonical:ubuntu_linux:charon-cmd

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 4/22/2026

Vulnerability Publication Date: 4/22/2026

Reference Information

CVE: CVE-2026-35328, CVE-2026-35329, CVE-2026-35330, CVE-2026-35331, CVE-2026-35332, CVE-2026-35333, CVE-2026-35334

USN: 8196-1