Linux Distros Unpatched Vulnerability : CVE-2026-87776

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

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  script_cve_id("CVE-2026-87776");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-87776");

  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.

  - compression is a Node.js and Express compression middleware. In versions before 1.8.2, when a client
    aborts the connection while a compressed response is still being sent, the zlib stream created to compress
    that response is never destroyed, so each aborted compressed response leaks its native zlib memory. A
    remote unauthenticated attacker can repeatedly open requests and disconnect early, exhausting the
    available memory and crashing the server. All applications using compression are affected. The issue is
    fixed in compression 1.8.2, and users should upgrade to 1.8.2 or later. (CVE-2026-87776)

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-2026-87776");
  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
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  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/11");

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  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("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/CentOS Linux-8", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

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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": "cockpit-ha-cluster"},
          {"reference": "grafana"},
          {"reference": "grafana-selinux"},
          {"reference": "intel-igc"},
          {"reference": "intel-igc-devel"},
          {"reference": "intel-igc-libs"},
          {"reference": "pcs"},
          {"reference": "pcs-snmp"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "grafana"},
          {"reference": "grafana-azure-monitor"},
          {"reference": "grafana-cloudwatch"},
          {"reference": "grafana-elasticsearch"},
          {"reference": "grafana-graphite"},
          {"reference": "grafana-influxdb"},
          {"reference": "grafana-loki"},
          {"reference": "grafana-mssql"},
          {"reference": "grafana-mysql"},
          {"reference": "grafana-opentsdb"},
          {"reference": "grafana-postgres"},
          {"reference": "grafana-prometheus"},
          {"reference": "grafana-selinux"},
          {"reference": "grafana-stackdriver"},
          {"reference": "pcs"},
          {"reference": "pcs-snmp"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "grafana"},
          {"reference": "grafana-azure-monitor"},
          {"reference": "grafana-cloudwatch"},
          {"reference": "grafana-elasticsearch"},
          {"reference": "grafana-graphite"},
          {"reference": "grafana-influxdb"},
          {"reference": "grafana-loki"},
          {"reference": "grafana-mssql"},
          {"reference": "grafana-mysql"},
          {"reference": "grafana-opentsdb"},
          {"reference": "grafana-postgres"},
          {"reference": "grafana-prometheus"},
          {"reference": "grafana-selinux"},
          {"reference": "grafana-stackdriver"},
          {"reference": "pcs"},
          {"reference": "pcs-snmp"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "aspnetcore-runtime-6.0"},
          {"reference": "aspnetcore-runtime-7.0"},
          {"reference": "aspnetcore-targeting-pack-6.0"},
          {"reference": "aspnetcore-targeting-pack-7.0"},
          {"reference": "dotnet-apphost-pack-6.0"},
          {"reference": "dotnet-apphost-pack-7.0"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-6.0"},
          {"reference": "dotnet-hostfxr-7.0"},
          {"reference": "dotnet-runtime-6.0"},
          {"reference": "dotnet-runtime-7.0"},
          {"reference": "dotnet-sdk-6.0"},
          {"reference": "dotnet-sdk-6.0-source-built-artifacts"},
          {"reference": "dotnet-sdk-7.0"},
          {"reference": "dotnet-sdk-7.0-source-built-artifacts"},
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          {"reference": "dotnet-targeting-pack-7.0"},
          {"reference": "dotnet-templates-6.0"},
          {"reference": "dotnet-templates-7.0"},
          {"reference": "dotnet6.0"},
          {"reference": "dotnet7.0"},
          {"reference": "grafana"},
          {"reference": "grafana-selinux"},
          {"reference": "netstandard-targeting-pack-2.1"},
          {"reference": "pcs"},
          {"reference": "pcs-snmp"}
        ]
      }
    ]
  }
};

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');
}