Linux Distros Unpatched Vulnerability : CVE-2026-19672

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

include('compat.inc');

if (description)
{
  script_id(338288);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/20");

  script_cve_id("CVE-2026-19672");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-19672");

  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.

  - The tarfile module's tar and data extraction filters created directories outside the destination for
    members whose name leaves the destination and returns to it, such as ../evil/../dest/sub/file. The
    containment check used the resolved path, but intermediate directories were created from the name as
    given. Only empty directories are created outside the destination. Member contents are still extracted
    inside it. To return to the destination the member's name must contain the destination directory's own
    final component, so extraction into a secure randomised directory is not affected. This affects POSIX
    platforms only. On Windows, .. components are collapsed before the path reaches the filesystem, so the
    directories outside the destination are never created. (CVE-2026-19672)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-19672");
  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: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:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-19672");

  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:"2026/08/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  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:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python2.7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.14");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.9");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  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/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "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-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/Debian/dpkg-l"))) 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": "idle-python2.7"},
          {"reference": "idle-python3.4"},
          {"reference": "libpython2.7"},
          {"reference": "libpython2.7-dbg"},
          {"reference": "libpython2.7-dev"},
          {"reference": "libpython2.7-minimal"},
          {"reference": "libpython2.7-stdlib"},
          {"reference": "libpython2.7-testsuite"},
          {"reference": "libpython3.4"},
          {"reference": "libpython3.4-dbg"},
          {"reference": "libpython3.4-dev"},
          {"reference": "libpython3.4-minimal"},
          {"reference": "libpython3.4-stdlib"},
          {"reference": "libpython3.4-testsuite"},
          {"reference": "python2.7"},
          {"reference": "python2.7-dbg"},
          {"reference": "python2.7-dev"},
          {"reference": "python2.7-doc"},
          {"reference": "python2.7-examples"},
          {"reference": "python2.7-minimal"},
          {"reference": "python3.4"},
          {"reference": "python3.4-dbg"},
          {"reference": "python3.4-dev"},
          {"reference": "python3.4-doc"},
          {"reference": "python3.4-examples"},
          {"reference": "python3.4-minimal"},
          {"reference": "python3.5"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "idle-python2.7"},
          {"reference": "idle-python3.5"},
          {"reference": "libpython2.7"},
          {"reference": "libpython2.7-dbg"},
          {"reference": "libpython2.7-dev"},
          {"reference": "libpython2.7-minimal"},
          {"reference": "libpython2.7-stdlib"},
          {"reference": "libpython2.7-testsuite"},
          {"reference": "libpython3.5"},
          {"reference": "libpython3.5-dbg"},
          {"reference": "libpython3.5-dev"},
          {"reference": "libpython3.5-minimal"},
          {"reference": "libpython3.5-stdlib"},
          {"reference": "libpython3.5-testsuite"},
          {"reference": "python2.7"},
          {"reference": "python2.7-dbg"},
          {"reference": "python2.7-dev"},
          {"reference": "python2.7-doc"},
          {"reference": "python2.7-examples"},
          {"reference": "python2.7-minimal"},
          {"reference": "python3.5"},
          {"reference": "python3.5-dbg"},
          {"reference": "python3.5-dev"},
          {"reference": "python3.5-doc"},
          {"reference": "python3.5-examples"},
          {"reference": "python3.5-minimal"},
          {"reference": "python3.5-venv"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "idle-python2.7"},
          {"reference": "idle-python3.6"},
          {"reference": "libpython2.7"},
          {"reference": "libpython2.7-dbg"},
          {"reference": "libpython2.7-dev"},
          {"reference": "libpython2.7-minimal"},
          {"reference": "libpython2.7-stdlib"},
          {"reference": "libpython2.7-testsuite"},
          {"reference": "libpython3.6"},
          {"reference": "libpython3.6-dbg"},
          {"reference": "libpython3.6-dev"},
          {"reference": "libpython3.6-minimal"},
          {"reference": "libpython3.6-stdlib"},
          {"reference": "libpython3.6-testsuite"},
          {"reference": "python2.7"},
          {"reference": "python2.7-dbg"},
          {"reference": "python2.7-dev"},
          {"reference": "python2.7-doc"},
          {"reference": "python2.7-examples"},
          {"reference": "python2.7-minimal"},
          {"reference": "python3.6"},
          {"reference": "python3.6-dbg"},
          {"reference": "python3.6-dev"},
          {"reference": "python3.6-doc"},
          {"reference": "python3.6-examples"},
          {"reference": "python3.6-minimal"},
          {"reference": "python3.6-venv"},
          {"reference": "python3.7"},
          {"reference": "python3.8"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "idle-python3.8"},
          {"reference": "libpython3.8"},
          {"reference": "libpython3.8-dbg"},
          {"reference": "libpython3.8-dev"},
          {"reference": "libpython3.8-minimal"},
          {"reference": "libpython3.8-stdlib"},
          {"reference": "libpython3.8-testsuite"},
          {"reference": "python2.7"},
          {"reference": "python3.8"},
          {"reference": "python3.8-dbg"},
          {"reference": "python3.8-dev"},
          {"reference": "python3.8-doc"},
          {"reference": "python3.8-examples"},
          {"reference": "python3.8-minimal"},
          {"reference": "python3.8-venv"},
          {"reference": "python3.9"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "idle-python3.10"},
          {"reference": "libpython3.10"},
          {"reference": "libpython3.10-dbg"},
          {"reference": "libpython3.10-dev"},
          {"reference": "libpython3.10-minimal"},
          {"reference": "libpython3.10-stdlib"},
          {"reference": "libpython3.10-testsuite"},
          {"reference": "python2.7"},
          {"reference": "python3.10"},
          {"reference": "python3.10-dbg"},
          {"reference": "python3.10-dev"},
          {"reference": "python3.10-doc"},
          {"reference": "python3.10-examples"},
          {"reference": "python3.10-full"},
          {"reference": "python3.10-minimal"},
          {"reference": "python3.10-nopie"},
          {"reference": "python3.10-venv"},
          {"reference": "python3.11"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "idle-python3.12"},
          {"reference": "libpython3.12-dev"},
          {"reference": "libpython3.12-minimal"},
          {"reference": "libpython3.12-stdlib"},
          {"reference": "libpython3.12-testsuite"},
          {"reference": "libpython3.12t64"},
          {"reference": "libpython3.12t64-dbg"},
          {"reference": "python3.12"},
          {"reference": "python3.12-dbg"},
          {"reference": "python3.12-dev"},
          {"reference": "python3.12-doc"},
          {"reference": "python3.12-examples"},
          {"reference": "python3.12-full"},
          {"reference": "python3.12-minimal"},
          {"reference": "python3.12-nopie"},
          {"reference": "python3.12-venv"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "idle-python3.14"},
          {"reference": "libpython3.14"},
          {"reference": "libpython3.14-dbg"},
          {"reference": "libpython3.14-dev"},
          {"reference": "libpython3.14-minimal"},
          {"reference": "libpython3.14-stdlib"},
          {"reference": "libpython3.14-testsuite"},
          {"reference": "python3.14"},
          {"reference": "python3.14-dbg"},
          {"reference": "python3.14-dev"},
          {"reference": "python3.14-doc"},
          {"reference": "python3.14-examples"},
          {"reference": "python3.14-full"},
          {"reference": "python3.14-gdbm"},
          {"reference": "python3.14-minimal"},
          {"reference": "python3.14-nopie"},
          {"reference": "python3.14-tk"},
          {"reference": "python3.14-venv"}
        ]
      }
    ]
  }
};

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');
}