Elastic Beats metricbeat 8.0.x < 8.19.13 / 9.0.x < 9.2.5 DoS (ESA-2026-09)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(303930);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/30");

  script_cve_id("CVE-2026-26931");
  script_xref(name:"IAVA", value:"2026-A-0265");

  script_name(english:"Elastic Beats metricbeat 8.0.x < 8.19.13 / 9.0.x < 9.2.5 DoS (ESA-2026-09)");

  script_set_attribute(attribute:"synopsis", value:
"Elastic Beats metricbeat installed on the remote Windows host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Elastic Beats metricbeat installed on the remote host is 8.0.x prior to 8.19.13, 9.0.x prior to 9.2.5. 
It is, therefore, affected by a denial of service vulnerability. 

  - Memory Allocation with Excessive Size Value (CWE-789) in the Prometheus remote_write HTTP handler in
    Metricbeat can lead Denial of Service via Excessive Allocation (CAPEC-130). (CVE-2026-26931)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://discuss.elastic.co/t/metricbeat-8-19-13-9-2-5-security-update-esa-2026-09/385532
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ae5abf14");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Elastic Beats metricbeat version 8.19.13, 9.2.5 or later.");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:L/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:"cvss3_score_source", value:"CVE-2026-26931");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/a:elastic:beats_metricbeat");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

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

  script_dependencies("elastic_beats_metricbeat_win_installed.nbin");
  script_require_keys("installed_sw/Beats metricbeat", "SMB/Registry/Enumerated");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'windows'}}
  ],
  'checks': [
    {
      'product': {'name': 'Beats metricbeat', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '8.0.0', 'fixed_version': '8.19.13'},
        {'min_version': '9.0.0', 'fixed_version': '9.2.5'}
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result:result);