Linux Distros Unpatched Vulnerability : CVE-2026-45623

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

include('compat.inc');

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  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/29");

  script_cve_id("CVE-2026-45623");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-45623");

  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.

  - PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules
    into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the /*#
    sourceMappingURL=PATH */ comment from any CSS string passed to process() and dereferences PATH against the
    local filesystem with no scheme, allowlist, or traversal check. An attacker who controls the CSS input can
    cause the host process to read any file readable by Node and leak the first ~10 bytes of its content
    through the resulting JSON.parse SyntaxError message. The bug also yields a precise file-existence oracle
    and a controllable-read primitive that may be combined with large-file targets for DoS. The behaviour is
    triggered with PostCSS's default options  no from, no map, no plugins required  and is therefore
    reachable from any pipeline that runs untrusted CSS through PostCSS (CMS themes, user-uploaded styles,
    browser-extension/userstyle processors, build pipelines for third-party packages, blog comment renderers,
    etc.). This issue has been fixed in version 8.5.12. (CVE-2026-45623)

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-2026-45623");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-45623");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-45623");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-45623");

  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:"2026/07/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/28");

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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:firefox-x11");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grafana");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grafana-postgres");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pcs-snmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python-syspurpose");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rhsm-gtk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subscription-manager");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subscription-manager-cockpit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subscription-manager-gui");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subscription-manager-initial-setup-addon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subscription-manager-migration");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subscription-manager-plugin-container");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subscription-manager-plugin-ostree");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subscription-manager-rhsm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subscription-manager-rhsm-certificates");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:thunderbird");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:node-postcss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:firefox");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:firefox-x11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gjs");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:subscription-manager-migration");
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  script_category(ACT_GATHER_INFO);
  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-7", "Host/OS/CentOS Linux-8", "Host/OS/Debian Linux-11", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-26.04");

  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": "node-postcss"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "node-postcss"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "node-postcss"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "node-postcss"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "node-postcss"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "node-postcss"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "node-postcss"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "firefox"},
          {"reference": "goose"},
          {"reference": "grafana"},
          {"reference": "grafana-selinux"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "python-syspurpose"},
          {"reference": "rhsm-gtk"},
          {"reference": "subscription-manager"},
          {"reference": "subscription-manager-cockpit"},
          {"reference": "subscription-manager-gui"},
          {"reference": "subscription-manager-initial-setup-addon"},
          {"reference": "subscription-manager-migration"},
          {"reference": "subscription-manager-plugin-container"},
          {"reference": "subscription-manager-plugin-ostree"},
          {"reference": "subscription-manager-rhsm"},
          {"reference": "subscription-manager-rhsm-certificates"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "python-syspurpose"},
          {"reference": "rhsm-gtk"},
          {"reference": "subscription-manager"},
          {"reference": "subscription-manager-cockpit"},
          {"reference": "subscription-manager-gui"},
          {"reference": "subscription-manager-initial-setup-addon"},
          {"reference": "subscription-manager-migration"},
          {"reference": "subscription-manager-plugin-container"},
          {"reference": "subscription-manager-plugin-ostree"},
          {"reference": "subscription-manager-rhsm"},
          {"reference": "subscription-manager-rhsm-certificates"}
        ]
      }
    ]
  },
  "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": "pcs"},
          {"reference": "pcs-snmp"},
          {"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": "pcs"},
          {"reference": "pcs-snmp"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "firefox"},
          {"reference": "firefox-x11"},
          {"reference": "gjs"},
          {"reference": "gjs-devel"},
          {"reference": "goose"},
          {"reference": "grafana"},
          {"reference": "grafana-selinux"},
          {"reference": "pcs"},
          {"reference": "pcs-snmp"},
          {"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 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_HOLE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}