Microsoft ASP.NET Core DoS (March 2026)

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

include('compat.inc');

if (description)
{
  script_id(301994);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/13");

  script_cve_id("CVE-2026-26130");
  script_xref(name:"MSKB", value:"5081278");
  script_xref(name:"MSKB", value:"5081277");
  script_xref(name:"MSKB", value:"5081276");
  script_xref(name:"MSFT", value:"MS26-5081278");
  script_xref(name:"MSFT", value:"MS26-5081277");
  script_xref(name:"MSFT", value:"MS26-5081276");
  script_xref(name:"IAVA", value:"2026-A-0225");

  script_name(english:"Microsoft ASP.NET Core DoS (March 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of ASP.NET Core installed on the remote Windows host is 8.0.x prior to 8.0.25, 9.0.x prior to
9.0.14, or 10.0.x prior to 10.0.4. It is, therefore, affected by a denial of service vulnerability. A
specially crafted message to a SignalR server can cause uncontrolled resource consumption, exhausting an
internal buffer and leading to denial of service.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26130");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/aspnetcore/issues/65727");
  # https://dotnet.microsoft.com/en-us/download/dotnet/10.0
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5492958f");
  # https://dotnet.microsoft.com/en-us/download/dotnet/9.0
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?83dd3f59");
  # https://dotnet.microsoft.com/en-us/download/dotnet/8.0
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2e94e4fc");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5081278");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5081277");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5081276");
  script_set_attribute(attribute:"solution", value:
"Update ASP.NET Core to version 8.0.25, 9.0.14, 10.0.4 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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:L/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-2026-26130");

  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:"2026/03/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:asp.net_core");
  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("microsoft_asp_dotnet_core_win.nbin");
  script_require_keys("SMB/Registry/Enumerated", "installed_sw/ASP .NET Core Windows");

  exit(0);
}

include('vcf.inc');

var app_info = vcf::get_app_info(app:'ASP .NET Core Windows', win_local:TRUE);

var constraints = [
  {'min_version': '8.0',  'fixed_version': '8.0.25'},
  {'min_version': '9.0',  'fixed_version': '9.0.14'},
  {'min_version': '10.0',  'fixed_version': '10.0.4'}
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);