Security Updates for Microsoft .NET Framework (July 2026)

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the Microsoft Security Updates API. The text
# itself is copyright (C) Microsoft Corporation.
#
##

include('compat.inc');

if (description)
{
  script_id(329339);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/24");

  script_cve_id(
    "CVE-2026-47302",
    "CVE-2026-47304",
    "CVE-2026-50304",
    "CVE-2026-50324",
    "CVE-2026-50355",
    "CVE-2026-50368",
    "CVE-2026-50411",
    "CVE-2026-50525",
    "CVE-2026-50527",
    "CVE-2026-50646",
    "CVE-2026-50647",
    "CVE-2026-50648",
    "CVE-2026-50649",
    "CVE-2026-50650",
    "CVE-2026-50652",
    "CVE-2026-50653",
    "CVE-2026-50659",
    "CVE-2026-56158"
  );
  script_xref(name:"MSKB", value:"5099535");
  script_xref(name:"MSKB", value:"5100984");
  script_xref(name:"MSKB", value:"5100985");
  script_xref(name:"MSKB", value:"5100989");
  script_xref(name:"MSKB", value:"5100990");
  script_xref(name:"MSKB", value:"5100991");
  script_xref(name:"MSKB", value:"5100998");
  script_xref(name:"MSKB", value:"5101000");
  script_xref(name:"MSKB", value:"5101001");
  script_xref(name:"MSKB", value:"5101002");
  script_xref(name:"MSKB", value:"5101003");
  script_xref(name:"MSKB", value:"5101004");
  script_xref(name:"MSKB", value:"5101005");
  script_xref(name:"MSKB", value:"5101006");
  script_xref(name:"MSKB", value:"5101007");
  script_xref(name:"MSKB", value:"5101008");
  script_xref(name:"MSKB", value:"5101009");
  script_xref(name:"MSKB", value:"5101010");
  script_xref(name:"MSKB", value:"5101011");
  script_xref(name:"MSKB", value:"5101014");
  script_xref(name:"MSFT", value:"MS26-5099535");
  script_xref(name:"MSFT", value:"MS26-5100984");
  script_xref(name:"MSFT", value:"MS26-5100985");
  script_xref(name:"MSFT", value:"MS26-5100989");
  script_xref(name:"MSFT", value:"MS26-5100990");
  script_xref(name:"MSFT", value:"MS26-5100991");
  script_xref(name:"MSFT", value:"MS26-5100998");
  script_xref(name:"MSFT", value:"MS26-5101000");
  script_xref(name:"MSFT", value:"MS26-5101001");
  script_xref(name:"MSFT", value:"MS26-5101002");
  script_xref(name:"MSFT", value:"MS26-5101003");
  script_xref(name:"MSFT", value:"MS26-5101004");
  script_xref(name:"MSFT", value:"MS26-5101005");
  script_xref(name:"MSFT", value:"MS26-5101006");
  script_xref(name:"MSFT", value:"MS26-5101007");
  script_xref(name:"MSFT", value:"MS26-5101008");
  script_xref(name:"MSFT", value:"MS26-5101009");
  script_xref(name:"MSFT", value:"MS26-5101010");
  script_xref(name:"MSFT", value:"MS26-5101011");
  script_xref(name:"MSFT", value:"MS26-5101014");
  script_xref(name:"IAVA", value:"2026-A-0718");

  script_name(english:"Security Updates for Microsoft .NET Framework (July 2026)");

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

  - Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny
    service over a network. (CVE-2026-47302)

  - Stack-based buffer overflow in .NET Framework allows an unauthorized attacker to deny service over a
    network. (CVE-2026-50527)

  - Protection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.
    (CVE-2026-50646)

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/5099535");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5100984");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5100985");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5100989");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5100990");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5100991");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5100998");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101000");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101001");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101002");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101003");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101004");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101005");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101006");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101007");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101008");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101009");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101010");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101011");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5101014");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
  -KB5099535
  -KB5100984
  -KB5100985
  -KB5100989
  -KB5100990
  -KB5100991
  -KB5100998
  -KB5101000
  -KB5101001
  -KB5101002
  -KB5101003
  -KB5101004
  -KB5101005
  -KB5101006
  -KB5101007
  -KB5101008
  -KB5101009
  -KB5101010
  -KB5101011
  -KB5101014");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-50646");
  script_cwe_id(94, 116, 121, 345, 347, 400, 502, 693, 770, 835);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:.net_framework");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

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

  script_dependencies("smb_check_dotnet_rollup.nasl", "smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl", "microsoft_net_framework_installed.nasl");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include('install_func.inc');
include('smb_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

var bulletin = 'MS26-07';
var kbs = make_list(
  '5099535',
  '5100984',
  '5100985',
  '5100989',
  '5100990',
  '5100991',
  '5100998',
  '5101000',
  '5101001',
  '5101002',
  '5101003',
  '5101004',
  '5101005',
  '5101006',
  '5101007',
  '5101008',
  '5101009',
  '5101010',
  '5101011',
  '5101014'
);

if (get_kb_item('Host/patch_management_checks')) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE);

get_kb_item_or_exit('SMB/Registry/Enumerated');
get_kb_item_or_exit('SMB/WindowsVersion', exit_code:1);

if (hotfix_check_sp_range(win10:'0') <= 0) audit(AUDIT_OS_SP_NOT_VULN);

var share = hotfix_get_systemdrive(exit_on_fail:TRUE, as_share:TRUE);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);

var app = 'Microsoft .NET Framework';
get_install_count(app_name:app, exit_if_zero:TRUE);
var installs = get_combined_installs(app_name:app);

var install, version;
var vuln = 0;

if (installs[0] == 0)
{
  foreach install (installs[1])
  {
    version = install['version'];
    if( version != UNKNOWN_VER &&
        smb_check_dotnet_rollup(rollup_date:'07_2026', dotnet_ver:version))
      vuln++;
  }
}
if(vuln)
{
  hotfix_security_hole();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}