Linux Distros Unpatched Vulnerability : CVE-2026-86472

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

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  script_cve_id("CVE-2026-86472");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-86472");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before
    2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before
    it percent-decodes the host, so a percent-encoded uppercase octet such as %41 decodes to a literal A that
    is never folded. For a scheme-relative reference such as //host there is no scheme, so the host
    canonicalization that would normally repair this does not run, and parse, normalize, and equal then
    disagree on the same host. An application that makes a case-sensitive host decision on fast-uri output,
    for example a host allowlist or denylist that compares the parsed host or uses equal, can be steered past
    the check with a percent-encoded uppercase octet, and because hostnames are case-insensitive in DNS and
    HTTP the evading spelling still reaches the host the check meant to gate. The issue is fixed in fast-uri
    2.4.7, 3.1.8, and 4.1.5, and users should upgrade to one of those versions or later. As a workaround,
    compare hosts case-insensitively by lowercasing the parsed host before any allowlist or denylist decision.
    (CVE-2026-86472)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-86472");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-86472");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/15");
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  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
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if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "aspnetcore-runtime-8.0"},
          {"reference": "aspnetcore-runtime-dbg-8.0"},
          {"reference": "aspnetcore-targeting-pack-8.0"},
          {"reference": "cockpit-image-builder"},
          {"reference": "dotnet-apphost-pack-8.0"},
          {"reference": "dotnet-hostfxr-8.0"},
          {"reference": "dotnet-runtime-8.0"},
          {"reference": "dotnet-runtime-dbg-8.0"},
          {"reference": "dotnet-sdk-8.0"},
          {"reference": "dotnet-sdk-8.0-source-built-artifacts"},
          {"reference": "dotnet-sdk-dbg-8.0"},
          {"reference": "dotnet-targeting-pack-8.0"},
          {"reference": "dotnet-templates-8.0"},
          {"reference": "dotnet8.0"},
          {"reference": "grafana"},
          {"reference": "grafana-pcp"},
          {"reference": "grafana-selinux"},
          {"reference": "linux-sgx"},
          {"reference": "sgx-common"},
          {"reference": "sgx-libs"},
          {"reference": "sgx-mpa"},
          {"reference": "sgx-pccs"},
          {"reference": "sgx-pccs-admin"},
          {"reference": "sgx-pckid-tool"},
          {"reference": "tdx-qgs"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "aspnetcore-runtime-8.0"},
          {"reference": "aspnetcore-runtime-dbg-8.0"},
          {"reference": "aspnetcore-targeting-pack-8.0"},
          {"reference": "dotnet"},
          {"reference": "dotnet-apphost-pack-8.0"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-8.0"},
          {"reference": "dotnet-runtime-8.0"},
          {"reference": "dotnet-runtime-dbg-8.0"},
          {"reference": "dotnet-sdk-8.0"},
          {"reference": "dotnet-sdk-8.0-source-built-artifacts"},
          {"reference": "dotnet-sdk-dbg-8.0"},
          {"reference": "dotnet-targeting-pack-8.0"},
          {"reference": "dotnet-templates-8.0"},
          {"reference": "dotnet8.0"},
          {"reference": "netstandard-targeting-pack-2.1"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "aspnetcore-runtime-8.0"},
          {"reference": "aspnetcore-runtime-dbg-8.0"},
          {"reference": "aspnetcore-targeting-pack-8.0"},
          {"reference": "dotnet"},
          {"reference": "dotnet-apphost-pack-8.0"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-8.0"},
          {"reference": "dotnet-runtime-8.0"},
          {"reference": "dotnet-runtime-dbg-8.0"},
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          {"reference": "dotnet8.0"},
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      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "aspnetcore-runtime-8.0"},
          {"reference": "aspnetcore-runtime-dbg-8.0"},
          {"reference": "aspnetcore-targeting-pack-8.0"},
          {"reference": "dotnet-apphost-pack-8.0"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-8.0"},
          {"reference": "dotnet-runtime-8.0"},
          {"reference": "dotnet-runtime-dbg-8.0"},
          {"reference": "dotnet-sdk-8.0"},
          {"reference": "dotnet-sdk-8.0-source-built-artifacts"},
          {"reference": "dotnet-sdk-dbg-8.0"},
          {"reference": "dotnet-targeting-pack-8.0"},
          {"reference": "dotnet-templates-8.0"},
          {"reference": "dotnet8.0"},
          {"reference": "linux-sgx"},
          {"reference": "netstandard-targeting-pack-2.1"},
          {"reference": "sgx-common"},
          {"reference": "sgx-libs"},
          {"reference": "sgx-mpa"},
          {"reference": "sgx-pccs"},
          {"reference": "sgx-pccs-admin"},
          {"reference": "sgx-pckid-tool"},
          {"reference": "tdx-qgs"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}