Linux Distros Unpatched Vulnerability : CVE-2026-27601

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

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  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/16");

  script_cve_id("CVE-2026-27601");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-27601");

  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.

  - Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual
    functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker
    could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input
    must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth
    limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten,
    the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure
    that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to
    _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path
    in which two distinct datastructures that were submitted by the same remote client are compared using
    _.isEqual. For example, if a client submits data that are stored in a database, and the same client can
    later submit another datastructure that is then compared to the data that were saved in the database
    previously, OR if a client submits a single request, but its data are parsed twice, creating two non-
    identical but equivalent datastructures that are then compared. Exceptions originating from the call to
    _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed
    in 1.13.8. (CVE-2026-27601)

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-2026-27601");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-27601");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-27601");
  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:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:U/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:P/RL:U/RC:C");
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  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-27601");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/05");

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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");
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  exit(0);
}

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/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "libjs-underscore"},
          {"reference": "node-underscore"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "libjs-underscore"},
          {"reference": "node-underscore"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "libjs-underscore"},
          {"reference": "node-underscore"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "ruby-rails-assets-underscore"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "ruby-rails-assets-underscore"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "ruby-rails-assets-underscore"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "ruby-rails-assets-underscore"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "firefox"},
          {"reference": "gjs"},
          {"reference": "gjs-devel"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "firefox"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "firefox"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "firefox"},
          {"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": "mozjs60"},
          {"reference": "mozjs60-devel"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "firefox"},
          {"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": "mozjs60"},
          {"reference": "mozjs60-devel"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "aspnetcore-runtime-7.0"},
          {"reference": "aspnetcore-targeting-pack-7.0"},
          {"reference": "dotnet-apphost-pack-7.0"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-7.0"},
          {"reference": "dotnet-runtime-7.0"},
          {"reference": "dotnet-sdk-7.0"},
          {"reference": "dotnet-sdk-7.0-source-built-artifacts"},
          {"reference": "dotnet-targeting-pack-7.0"},
          {"reference": "dotnet-templates-7.0"},
          {"reference": "dotnet7.0"},
          {"reference": "firefox"},
          {"reference": "firefox-x11"},
          {"reference": "gjs"},
          {"reference": "gjs-devel"},
          {"reference": "grafana"},
          {"reference": "grafana-selinux"},
          {"reference": "netstandard-targeting-pack-2.1"},
          {"reference": "python-sphinx-doc"},
          {"reference": "python3-sphinx"},
          {"reference": "python3-sphinx-latex"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  }
};

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

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