Security Updates for Microsoft SQL Server (October 2026)

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

include('compat.inc');

if (description)
{
  script_id(365626);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/15");

  script_cve_id(
    "CVE-2026-65674",
    "CVE-2026-67625",
    "CVE-2026-67626",
    "CVE-2026-67628",
    "CVE-2026-68883",
    "CVE-2026-70189",
    "CVE-2026-83945",
    "CVE-2026-85876",
    "CVE-2026-85886",
    "CVE-2026-85888",
    "CVE-2026-85919",
    "CVE-2026-88081",
    "CVE-2026-88082",
    "CVE-2026-88083",
    "CVE-2026-88084",
    "CVE-2026-88085",
    "CVE-2026-88086",
    "CVE-2026-88088",
    "CVE-2026-88089",
    "CVE-2026-94512",
    "CVE-2026-94520",
    "CVE-2026-96956"
  );
  script_xref(name:"MSKB", value:"5126934");
  script_xref(name:"MSKB", value:"5126967");
  script_xref(name:"MSKB", value:"5128492");
  script_xref(name:"MSKB", value:"5128493");
  script_xref(name:"MSKB", value:"5128494");
  script_xref(name:"MSKB", value:"5128495");
  script_xref(name:"MSKB", value:"5128496");
  script_xref(name:"MSKB", value:"5128497");
  script_xref(name:"MSFT", value:"MS26-5126934");
  script_xref(name:"MSFT", value:"MS26-5126967");
  script_xref(name:"MSFT", value:"MS26-5128492");
  script_xref(name:"MSFT", value:"MS26-5128493");
  script_xref(name:"MSFT", value:"MS26-5128494");
  script_xref(name:"MSFT", value:"MS26-5128495");
  script_xref(name:"MSFT", value:"MS26-5128496");
  script_xref(name:"MSFT", value:"MS26-5128497");

  script_name(english:"Security Updates for Microsoft SQL Server (October 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft SQL Server installation on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft SQL Server installation on the remote host is missing security updates. It is,
therefore, affected by multiple vulnerabilities:

  - Deserialization of untrusted data in SQL Server allows an authorized attacker to execute code over a
    network. (CVE-2026-65674)

  - Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
    (CVE-2026-94512)

  - Stack-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.
    (CVE-2026-88083)

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://support.microsoft.com/help/5126934");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5126967");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5128492");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5128493");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5128494");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5128495");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5128496");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5128497");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
  -KB5126934
  -KB5126967
  -KB5128492
  -KB5128493
  -KB5128494
  -KB5128495
  -KB5128496
  -KB5128497");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:M/C:C/I:C/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:L/PR:L/UI:N/S:U/C:H/I:H/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-2026-70189");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-94512");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(20, 121, 122, 125, 134, 190, 400, 416, 502, 770);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/14");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:sql_server");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("mssqlserver_detect.nasl");
  script_require_keys("Settings/ParanoidReport");
  script_require_ports(139, 445, 1433, "Services/mssql");

  exit(0);
}

var port = get_service(svc:'mssql', exit_on_fail:TRUE);
var instance = get_kb_item('MSSQL/' + port + '/InstanceName');
var version = get_kb_item_or_exit('MSSQL/' + port + '/Version');

if (report_paranoia < 2) audit(AUDIT_PARANOID);

var ver = pregmatch(pattern:"^([0-9.]+)([^0-9]|$)", string:version);
if (!isnull(ver) && !isnull(ver[1])) ver = ver[1];

if (
  (ver_compare(ver:ver, minver:'14.0.1000.0', fix: '14.0.2140.0') < 0) ||
  (ver_compare(ver:ver, minver:'14.0.3006.0', fix: '14.0.3560.0') < 0) ||
  (ver_compare(ver:ver, minver:'15.0.2000.0', fix: '15.0.2200.0') < 0) ||
  (ver_compare(ver:ver, minver:'15.0.4003.0', fix: '15.0.4500.0') < 0) ||
  (ver_compare(ver:ver, minver:'16.0.1000.0', fix: '16.0.1210.0') < 0) ||
  (ver_compare(ver:ver, minver:'16.0.4003.0', fix: '16.0.4305.0') < 0) ||
  (ver_compare(ver:ver, minver:'17.0.1000.0', fix: '17.0.1145.0') < 0) ||
  (ver_compare(ver:ver, minver:'17.0.4006.0', fix: '17.0.5015.0') < 0)
)
{
  var report = '';
  if (!empty_or_null(version))  report += '\n  SQL Server Version   : ' + version;
  if (!empty_or_null(instance)) report += '\n  SQL Server Instance  : ' + instance;
  security_report_v4(port:port, extra:report, severity:SECURITY_WARNING);
}
else audit(AUDIT_INST_VER_NOT_VULN, 'MSSQL', version);