Linux Distros Unpatched Vulnerability : CVE-2026-24733

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

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if (description)
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  script_id(299445);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/03");

  script_cve_id("CVE-2026-24733");
  script_xref(name:"IAVA", value:"2026-A-0175-S");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-24733");

  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.

  - Improper Input Validation vulnerability in Apache Tomcat. Tomcat did not limit HTTP/0.9 requests to the
    GET method. If a security constraint was configured to allow HEAD requests to a URI but deny GET requests,
    the user could bypass that constraint on GET requests by sending a (specification invalid) HEAD request
    using HTTP/0.9. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through
    10.1.49, from 9.0.0.M1 through 9.0.112. Older, EOL versions are also affected. Users are recommended to
    upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fixes the issue.
    (CVE-2026-24733)

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-2026-24733");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-24733");
  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: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:N/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-2026-24733");

  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:"2025/12/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
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  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:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:tomcat6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:tomcat9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-servlet-4.0-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pki-servlet-engine");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat-admin-webapps");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat-docs-webapp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat-el-3.0-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat-el-5.0-api");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat-lib");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat-servlet-6.0-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat-webapps");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat9-docs-webapp");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tomcat9-webapps");
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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-8", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.10", "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 = {
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "tomcat6"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "tomcat9"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "tomcat9"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "tomcat9"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "tomcat10"},
          {"reference": "tomcat9"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "tomcat10"},
          {"reference": "tomcat11"},
          {"reference": "tomcat9"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "tomcat10"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "tomcat"},
          {"reference": "tomcat-admin-webapps"},
          {"reference": "tomcat-docs-webapp"},
          {"reference": "tomcat-el-5.0-api"},
          {"reference": "tomcat-jsp-3.1-api"},
          {"reference": "tomcat-lib"},
          {"reference": "tomcat-servlet-6.0-api"},
          {"reference": "tomcat-webapps"},
          {"reference": "tomcat9"},
          {"reference": "tomcat9-admin-webapps"},
          {"reference": "tomcat9-docs-webapp"},
          {"reference": "tomcat9-el-3.0-api"},
          {"reference": "tomcat9-jsp-2.3-api"},
          {"reference": "tomcat9-lib"},
          {"reference": "tomcat9-servlet-4.0-api"},
          {"reference": "tomcat9-webapps"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "pki-servlet-4.0-api"},
          {"reference": "pki-servlet-engine"},
          {"reference": "tomcat"},
          {"reference": "tomcat-admin-webapps"},
          {"reference": "tomcat-docs-webapp"},
          {"reference": "tomcat-el-3.0-api"},
          {"reference": "tomcat-jsp-2.3-api"},
          {"reference": "tomcat-lib"},
          {"reference": "tomcat-servlet-4.0-api"},
          {"reference": "tomcat-webapps"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "pki-servlet-4.0-api"},
          {"reference": "pki-servlet-engine"},
          {"reference": "tomcat"},
          {"reference": "tomcat-admin-webapps"},
          {"reference": "tomcat-docs-webapp"},
          {"reference": "tomcat-el-3.0-api"},
          {"reference": "tomcat-jsp-2.3-api"},
          {"reference": "tomcat-lib"},
          {"reference": "tomcat-servlet-4.0-api"},
          {"reference": "tomcat-webapps"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "pki-servlet-4.0-api"},
          {"reference": "pki-servlet-engine"},
          {"reference": "tomcat"},
          {"reference": "tomcat-admin-webapps"},
          {"reference": "tomcat-docs-webapp"},
          {"reference": "tomcat-el-3.0-api"},
          {"reference": "tomcat-jsp-2.3-api"},
          {"reference": "tomcat-lib"},
          {"reference": "tomcat-servlet-4.0-api"},
          {"reference": "tomcat-webapps"}
        ]
      }
    ]
  }
};

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_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}