Linux Distros Unpatched Vulnerability : CVE-2026-18047

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

include('compat.inc');

if (description)
{
  script_id(330485);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/29");

  script_cve_id("CVE-2026-18047");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-18047");

  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.

  - A flaw was found in Dogtag PKI's ACME responder where the web.xml security constraints use exact URL
    pattern matching for admin-only enable/disable endpoints. By appending a trailing slash to the URL, an
    unauthenticated attacker can bypass the Tomcat authentication constraint while RESTEasy still routes the
    request to the handler, allowing unauthorized toggling of the ACME service state including persistent
    denial of service. (CVE-2026-18047)

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-2026-18047");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-18047");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-18047");
  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:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:L/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-18047");

  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:"2026/07/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dogtag-pki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dogtag-pki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-jss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-jss-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-ldapjdk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-ldapjdk-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-acme");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-base-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-ca");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-est");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-kra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-symkey");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-pki-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:idm-tomcatjss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:jss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:jss-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ldapjdk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ldapjdk-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-acme");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-base-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-ca");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-kra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-symkey");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-idm-pki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-pki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:resteasy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:resteasy-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcatjss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dogtag-pki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dogtag-pki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-jss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-jss-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-ldapjdk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-ldapjdk-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-acme");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-base-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-ca");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-est");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-kra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-symkey");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-pki-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:idm-tomcatjss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:jss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:jss-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ldapjdk");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-acme");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-base-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-ca");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-kra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-symkey");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pki-tools");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:resteasy");
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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/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-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04");

  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": "dogtag-pki"},
          {"reference": "dogtag-pki-console-theme"},
          {"reference": "dogtag-pki-server-theme"},
          {"reference": "libsymkey-java"},
          {"reference": "libsymkey-jni"},
          {"reference": "pki-base"},
          {"reference": "pki-base-java"},
          {"reference": "pki-ca"},
          {"reference": "pki-console"},
          {"reference": "pki-javadoc"},
          {"reference": "pki-kra"},
          {"reference": "pki-ocsp"},
          {"reference": "pki-server"},
          {"reference": "pki-tks"},
          {"reference": "pki-tools"},
          {"reference": "pki-tps"},
          {"reference": "pki-tps-client"},
          {"reference": "python3-pki-base"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "dogtag-pki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "dogtag-pki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "dogtag-pki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "dogtag-pki"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "dogtag-pki"},
          {"reference": "idm-pki-acme"},
          {"reference": "idm-pki-base"},
          {"reference": "idm-pki-ca"},
          {"reference": "idm-pki-java"},
          {"reference": "idm-pki-kra"},
          {"reference": "idm-pki-server"},
          {"reference": "idm-pki-tools"},
          {"reference": "python3-idm-pki"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "pki-base"},
          {"reference": "pki-base-java"},
          {"reference": "pki-ca"},
          {"reference": "pki-core"},
          {"reference": "pki-javadoc"},
          {"reference": "pki-kra"},
          {"reference": "pki-server"},
          {"reference": "pki-symkey"},
          {"reference": "pki-tools"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "pki-base"},
          {"reference": "pki-base-java"},
          {"reference": "pki-ca"},
          {"reference": "pki-core"},
          {"reference": "pki-javadoc"},
          {"reference": "pki-kra"},
          {"reference": "pki-server"},
          {"reference": "pki-symkey"},
          {"reference": "pki-tools"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "idm-jss"},
          {"reference": "idm-jss-javadoc"},
          {"reference": "idm-ldapjdk"},
          {"reference": "idm-ldapjdk-javadoc"},
          {"reference": "idm-pki-acme"},
          {"reference": "idm-pki-base"},
          {"reference": "idm-pki-base-java"},
          {"reference": "idm-pki-ca"},
          {"reference": "idm-pki-kra"},
          {"reference": "idm-pki-server"},
          {"reference": "idm-pki-symkey"},
          {"reference": "idm-pki-tools"},
          {"reference": "idm-tomcatjss"},
          {"reference": "jss"},
          {"reference": "jss-javadoc"},
          {"reference": "ldapjdk"},
          {"reference": "ldapjdk-javadoc"},
          {"reference": "pki-acme"},
          {"reference": "pki-base"},
          {"reference": "pki-base-java"},
          {"reference": "pki-ca"},
          {"reference": "pki-core"},
          {"reference": "pki-kra"},
          {"reference": "pki-server"},
          {"reference": "pki-symkey"},
          {"reference": "pki-tools"},
          {"reference": "python3-idm-pki"},
          {"reference": "python3-pki"},
          {"reference": "resteasy"},
          {"reference": "resteasy-javadoc"},
          {"reference": "tomcatjss"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "idm-jss"},
          {"reference": "idm-jss-javadoc"},
          {"reference": "idm-ldapjdk"},
          {"reference": "idm-ldapjdk-javadoc"},
          {"reference": "idm-pki-acme"},
          {"reference": "idm-pki-base"},
          {"reference": "idm-pki-base-java"},
          {"reference": "idm-pki-ca"},
          {"reference": "idm-pki-kra"},
          {"reference": "idm-pki-server"},
          {"reference": "idm-pki-symkey"},
          {"reference": "idm-pki-tools"},
          {"reference": "idm-tomcatjss"},
          {"reference": "jss"},
          {"reference": "jss-javadoc"},
          {"reference": "ldapjdk"},
          {"reference": "ldapjdk-javadoc"},
          {"reference": "pki-acme"},
          {"reference": "pki-base"},
          {"reference": "pki-base-java"},
          {"reference": "pki-ca"},
          {"reference": "pki-core"},
          {"reference": "pki-kra"},
          {"reference": "pki-server"},
          {"reference": "pki-symkey"},
          {"reference": "pki-tools"},
          {"reference": "python3-idm-pki"},
          {"reference": "python3-pki"},
          {"reference": "resteasy"},
          {"reference": "resteasy-javadoc"},
          {"reference": "tomcatjss"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "idm-pki-acme"},
          {"reference": "idm-pki-base"},
          {"reference": "idm-pki-ca"},
          {"reference": "idm-pki-est"},
          {"reference": "idm-pki-java"},
          {"reference": "idm-pki-kra"},
          {"reference": "idm-pki-server"},
          {"reference": "idm-pki-tools"},
          {"reference": "pki-acme"},
          {"reference": "pki-base"},
          {"reference": "pki-base-java"},
          {"reference": "pki-ca"},
          {"reference": "pki-core"},
          {"reference": "pki-kra"},
          {"reference": "pki-server"},
          {"reference": "pki-symkey"},
          {"reference": "pki-tools"},
          {"reference": "python3-idm-pki"},
          {"reference": "python3-pki"}
        ]
      }
    ]
  }
};

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');
}