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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Debian Linux - strongswan - None (CVE-2026-35330)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6227 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6227-1                   security@debian.org     https://www.debian.org/security/                        Yves-Alexis Perez     April 22, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : strongswan     CVE ID         : CVE-2026-35328 CVE-2026-35329 CVE-2026-35330 CVE-2026-35331                      CVE-2026-35332 CVE-2026-35333 CVE-2026-35334

    Multiple vulnerabilities were fixed in strongSwan, an IKE/IPsec suite.

    CVE-2026-35328

        A vulnerability in libtls related to the processing of the         supported_versions extension in TLS that can result in an infinite         loop.

    CVE-2026-35329

        Vulnerabilities in libstrongswan and the pkcs7 plugin related to the         processing of encrypted PKCS#7 containers that can result in a crash.

    CVE-2026-35330

        A vulnerability in libsimaka related to the processing of certain         EAP-SIM/AKA attributes that can result in an infinite loop or a         heap-based buffer overflow and potentially remote code execution.

    CVE-2026-35331

        A vulnerability in the constraints plugin related to the processing of         X.509 name constraints that can allow authentication with certificates         that violate the constraints.

    CVE-2026-35332

        A vulnerability in libtls related to the processing of ECDH public         values in TLS < 1.3 that can result in a crash.

    CVE-2026-35333

        A vulnerability in libradius related to the processing of RADIUS         attributes that can result in an infinite loop or an out-of-bounds         read that may cause a crash.

    CVE-2026-35334

        A vulnerability in the gmp plugin related to RSA decryption that can         result in a crash.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 5.9.8-5+deb12u4.

    For the stable distribution (trixie), these problems have been fixed in     version 6.0.1-6+deb13u5.

    We recommend that you upgrade your strongswan packages.

    For the detailed security status of strongswan please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/strongswan

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

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

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

ID	Name	Product	Family	Severity
309912	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : strongSwan vulnerabilities (USN-8196-1)	Nessus	Ubuntu Local Security Checks	high
309703	Linux Distros Unpatched Vulnerability : CVE-2026-35330	Nessus	Misc.	critical
309664	Debian dsa-6227 : charon-cmd - security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2026-35330

high

Tenable Plugins

high

critical

high