The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:46397 advisory.

    Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and     uses strong cryptography to provide both authentication and encryption services. These services allow you     to build secure tunnels through untrusted networks such as virtual private network (VPN).

    Security Fix(es):

    * librenswan: IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload     (CVE-2026-50721)

    * librenswan: IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload     (CVE-2026-50722)

    * librenswan: IKEv2 Denial of Service via malformed fragmentation (CVE-2026-12413)

    * libreswan: badly formatted X.509 certificate can cause an assertion failure that crashes the daemon     process (CVE-2026-14957)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

Detections

Analytics

RHEL 9 : libreswan (RHSA-2026:46397)

medium Nessus Plugin ID 330064

Version 1.2

Version 1.1

Version 1.2 Aug 7, 2026, 5:10 PM Plugin metadata (Add IAVM Info) Plugin Feed: 202608071710
Version 1.1 Jul 27, 2026, 10:22 AM New Plugin Feed: 202607271022