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RHEL 9 : libreswan (RHSA-2026:46397)

🗓️ 27 Jul 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 5 Views

Libreswan on Red Hat Enterprise Linux nine fixes several IKE/IPsec vulnerabilities identified in RHSA-2026:46397.

Related
Refs
Code
ReporterTitlePublishedViews
Family
ATTACKERKB		CVE-2026-50722
2 Jul 202621:34
–attackerkb
ATTACKERKB		CVE-2026-12413
2 Jul 202621:19
–attackerkb
ATTACKERKB		CVE-2026-50721
2 Jul 202621:44
–attackerkb
AlpineLinux		CVE-2026-12413
2 Jul 202621:19
–alpinelinux
AlpineLinux		CVE-2026-50721
2 Jul 202621:44
–alpinelinux
AlpineLinux		CVE-2026-50722
2 Jul 202621:34
–alpinelinux
AlmaLinux		Important: libreswan security update
27 Jul 202600:00
–almalinux
AlmaLinux		Important: libreswan security update
27 Jul 202600:00
–almalinux
Tenable Nessus		Azure Linux 3.0 Security Update: CBL-Mariner Releases (CVE-2026-12413)
14 Jul 202600:00
–nessus
Tenable Nessus		Azure Linux 3.0 Security Update: CBL-Mariner Releases (CVE-2026-50721)
14 Jul 202600:00
–nessus
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:46397. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(330064);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/27");

  script_cve_id(
    "CVE-2026-12413",
    "CVE-2026-14957",
    "CVE-2026-50721",
    "CVE-2026-50722"
  );
  script_xref(name:"RHSA", value:"2026:46397");

  script_name(english:"RHEL 9 : libreswan (RHSA-2026:46397)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for libreswan.");
  script_set_attribute(attribute:"description", value:
"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.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2494147");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2494148");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2494149");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2501764");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_46397.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a7801f4a");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:46397");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL libreswan package based on the guidance in RHSA-2026:46397.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-50722");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(193, 347, 617);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/07/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:9.8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libreswan");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'Red Hat' >!< os_product) audit(AUDIT_OS_NOT, 'Red Hat');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release_list(operator: 'ge', os_version: os_version, rhel_versions: ['9','9.8'])) audit(AUDIT_OS_NOT, 'Red Hat 9.x', 'Red Hat ' + os_version);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'release': '9',
    'repo_relative_urls': [
      'content/dist/rhel9/9.1/aarch64/appstream/debug',
      'content/dist/rhel9/9.1/aarch64/appstream/os',
      'content/dist/rhel9/9.1/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9.1/ppc64le/appstream/debug',
      'content/dist/rhel9/9.1/ppc64le/appstream/os',
      'content/dist/rhel9/9.1/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9.1/s390x/appstream/debug',
      'content/dist/rhel9/9.1/s390x/appstream/os',
      'content/dist/rhel9/9.1/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9.1/x86_64/appstream/debug',
      'content/dist/rhel9/9.1/x86_64/appstream/os',
      'content/dist/rhel9/9.1/x86_64/appstream/source/SRPMS',
      'content/dist/rhel9/9.2/aarch64/appstream/debug',
      'content/dist/rhel9/9.2/aarch64/appstream/os',
      'content/dist/rhel9/9.2/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9.2/ppc64le/appstream/debug',
      'content/dist/rhel9/9.2/ppc64le/appstream/os',
      'content/dist/rhel9/9.2/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9.2/s390x/appstream/debug',
      'content/dist/rhel9/9.2/s390x/appstream/os',
      'content/dist/rhel9/9.2/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9.2/x86_64/appstream/debug',
      'content/dist/rhel9/9.2/x86_64/appstream/os',
      'content/dist/rhel9/9.2/x86_64/appstream/source/SRPMS',
      'content/dist/rhel9/9.3/aarch64/appstream/debug',
      'content/dist/rhel9/9.3/aarch64/appstream/os',
      'content/dist/rhel9/9.3/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9.3/ppc64le/appstream/debug',
      'content/dist/rhel9/9.3/ppc64le/appstream/os',
      'content/dist/rhel9/9.3/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9.3/s390x/appstream/debug',
      'content/dist/rhel9/9.3/s390x/appstream/os',
      'content/dist/rhel9/9.3/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9.3/x86_64/appstream/debug',
      'content/dist/rhel9/9.3/x86_64/appstream/os',
      'content/dist/rhel9/9.3/x86_64/appstream/source/SRPMS',
      'content/dist/rhel9/9.4/aarch64/appstream/debug',
      'content/dist/rhel9/9.4/aarch64/appstream/os',
      'content/dist/rhel9/9.4/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9.4/ppc64le/appstream/debug',
      'content/dist/rhel9/9.4/ppc64le/appstream/os',
      'content/dist/rhel9/9.4/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9.4/s390x/appstream/debug',
      'content/dist/rhel9/9.4/s390x/appstream/os',
      'content/dist/rhel9/9.4/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9.4/x86_64/appstream/debug',
      'content/dist/rhel9/9.4/x86_64/appstream/os',
      'content/dist/rhel9/9.4/x86_64/appstream/source/SRPMS',
      'content/dist/rhel9/9.5/aarch64/appstream/debug',
      'content/dist/rhel9/9.5/aarch64/appstream/os',
      'content/dist/rhel9/9.5/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9.5/ppc64le/appstream/debug',
      'content/dist/rhel9/9.5/ppc64le/appstream/os',
      'content/dist/rhel9/9.5/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9.5/s390x/appstream/debug',
      'content/dist/rhel9/9.5/s390x/appstream/os',
      'content/dist/rhel9/9.5/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9.5/x86_64/appstream/debug',
      'content/dist/rhel9/9.5/x86_64/appstream/os',
      'content/dist/rhel9/9.5/x86_64/appstream/source/SRPMS',
      'content/dist/rhel9/9.6/aarch64/appstream/debug',
      'content/dist/rhel9/9.6/aarch64/appstream/os',
      'content/dist/rhel9/9.6/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9.6/ppc64le/appstream/debug',
      'content/dist/rhel9/9.6/ppc64le/appstream/os',
      'content/dist/rhel9/9.6/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9.6/s390x/appstream/debug',
      'content/dist/rhel9/9.6/s390x/appstream/os',
      'content/dist/rhel9/9.6/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9.6/x86_64/appstream/debug',
      'content/dist/rhel9/9.6/x86_64/appstream/os',
      'content/dist/rhel9/9.6/x86_64/appstream/source/SRPMS',
      'content/dist/rhel9/9.7/aarch64/appstream/debug',
      'content/dist/rhel9/9.7/aarch64/appstream/os',
      'content/dist/rhel9/9.7/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9.7/ppc64le/appstream/debug',
      'content/dist/rhel9/9.7/ppc64le/appstream/os',
      'content/dist/rhel9/9.7/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9.7/s390x/appstream/debug',
      'content/dist/rhel9/9.7/s390x/appstream/os',
      'content/dist/rhel9/9.7/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9.7/x86_64/appstream/debug',
      'content/dist/rhel9/9.7/x86_64/appstream/os',
      'content/dist/rhel9/9.7/x86_64/appstream/source/SRPMS',
      'content/dist/rhel9/9.8/aarch64/appstream/debug',
      'content/dist/rhel9/9.8/aarch64/appstream/os',
      'content/dist/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9.8/ppc64le/appstream/debug',
      'content/dist/rhel9/9.8/ppc64le/appstream/os',
      'content/dist/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9.8/s390x/appstream/debug',
      'content/dist/rhel9/9.8/s390x/appstream/os',
      'content/dist/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9.8/x86_64/appstream/debug',
      'content/dist/rhel9/9.8/x86_64/appstream/os',
      'content/dist/rhel9/9.8/x86_64/appstream/source/SRPMS',
      'content/dist/rhel9/9.9/aarch64/appstream/debug',
      'content/dist/rhel9/9.9/aarch64/appstream/os',
      'content/dist/rhel9/9.9/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9.9/ppc64le/appstream/debug',
      'content/dist/rhel9/9.9/ppc64le/appstream/os',
      'content/dist/rhel9/9.9/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9.9/s390x/appstream/debug',
      'content/dist/rhel9/9.9/s390x/appstream/os',
      'content/dist/rhel9/9.9/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9.9/x86_64/appstream/debug',
      'content/dist/rhel9/9.9/x86_64/appstream/os',
      'content/dist/rhel9/9.9/x86_64/appstream/source/SRPMS',
      'content/dist/rhel9/9/aarch64/appstream/debug',
      'content/dist/rhel9/9/aarch64/appstream/os',
      'content/dist/rhel9/9/aarch64/appstream/source/SRPMS',
      'content/dist/rhel9/9/ppc64le/appstream/debug',
      'content/dist/rhel9/9/ppc64le/appstream/os',
      'content/dist/rhel9/9/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel9/9/s390x/appstream/debug',
      'content/dist/rhel9/9/s390x/appstream/os',
      'content/dist/rhel9/9/s390x/appstream/source/SRPMS',
      'content/dist/rhel9/9/x86_64/appstream/debug',
      'content/dist/rhel9/9/x86_64/appstream/os',
      'content/dist/rhel9/9/x86_64/appstream/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/aarch64/appstream/debug',
      'content/public/ubi/dist/ubi9/9/aarch64/appstream/os',
      'content/public/ubi/dist/ubi9/9/aarch64/appstream/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/ppc64le/appstream/debug',
      'content/public/ubi/dist/ubi9/9/ppc64le/appstream/os',
      'content/public/ubi/dist/ubi9/9/ppc64le/appstream/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/s390x/appstream/debug',
      'content/public/ubi/dist/ubi9/9/s390x/appstream/os',
      'content/public/ubi/dist/ubi9/9/s390x/appstream/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/x86_64/appstream/debug',
      'content/public/ubi/dist/ubi9/9/x86_64/appstream/os',
      'content/public/ubi/dist/ubi9/9/x86_64/appstream/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'libreswan-4.15-10.el9_8', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '9',
    'sp': '8',
    'repo_relative_urls': [
      'content/e4s/rhel9/9.8/aarch64/appstream/debug',
      'content/e4s/rhel9/9.8/aarch64/appstream/os',
      'content/e4s/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/ppc64le/appstream/debug',
      'content/e4s/rhel9/9.8/ppc64le/appstream/os',
      'content/e4s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/s390x/appstream/debug',
      'content/e4s/rhel9/9.8/s390x/appstream/os',
      'content/e4s/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/x86_64/appstream/debug',
      'content/e4s/rhel9/9.8/x86_64/appstream/os',
      'content/e4s/rhel9/9.8/x86_64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/aarch64/appstream/debug',
      'content/e6s/rhel9/9.8/aarch64/appstream/os',
      'content/e6s/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/ppc64le/appstream/debug',
      'content/e6s/rhel9/9.8/ppc64le/appstream/os',
      'content/e6s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/s390x/appstream/debug',
      'content/e6s/rhel9/9.8/s390x/appstream/os',
      'content/e6s/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/x86_64/appstream/debug',
      'content/e6s/rhel9/9.8/x86_64/appstream/os',
      'content/e6s/rhel9/9.8/x86_64/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/aarch64/appstream/debug',
      'content/eus/rhel9/9.8/aarch64/appstream/os',
      'content/eus/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/ppc64le/appstream/debug',
      'content/eus/rhel9/9.8/ppc64le/appstream/os',
      'content/eus/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/s390x/appstream/debug',
      'content/eus/rhel9/9.8/s390x/appstream/os',
      'content/eus/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/x86_64/appstream/debug',
      'content/eus/rhel9/9.8/x86_64/appstream/os',
      'content/eus/rhel9/9.8/x86_64/appstream/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'libreswan-4.15-10.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var repo_relative_urls;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }

  if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(rpm:exists_check))) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libreswan');
}

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27 Jul 2026 00:00Current
6Medium risk
Vulners AI Score6
CVSS 3.15.9 - 8.1
EPSS0.00598
SSVC
red hat advisorylibreswan vulnerabilitiesike vulnerabilitiescve 2026 50721cve 2026 50722cve 2026 12413cve 2026 14957
5