Linux Distros Unpatched Vulnerability : CVE-2026-42479

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

include('compat.inc');

if (description)
{
  script_id(311789);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");

  script_cve_id("CVE-2026-42479");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-42479");

  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.

  - An out-of-bounds read vulnerability in VrmlData_IndexedLineSet::TShape in the VRML parser in Open CASCADE
    Technology (OCCT) V8_0_0_rc5 allows attackers to cause a denial of service via a crafted VRML file. The
    issue occurs because coordIndex values from parsed input are used as direct array indices without
    validation against the size of the coordinate array during geometry processing. (CVE-2026-42479)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42479");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-42479");
  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:M/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-42479");

  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:"2026/05/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:opencascade");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:opencascade");
  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/Debian Linux-11", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.10");

  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 = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "libocct-data-exchange-7.6"},
          {"reference": "libocct-data-exchange-dev"},
          {"reference": "libocct-doc"},
          {"reference": "libocct-draw-7.6"},
          {"reference": "libocct-draw-dev"},
          {"reference": "libocct-foundation-7.6"},
          {"reference": "libocct-foundation-dev"},
          {"reference": "libocct-modeling-algorithms-7.6"},
          {"reference": "libocct-modeling-algorithms-dev"},
          {"reference": "libocct-modeling-data-7.6"},
          {"reference": "libocct-modeling-data-dev"},
          {"reference": "libocct-ocaf-7.6"},
          {"reference": "libocct-ocaf-dev"},
          {"reference": "libocct-visualization-7.6"},
          {"reference": "libocct-visualization-dev"},
          {"reference": "occt-draw"},
          {"reference": "occt-misc"}
        ]
      }
    ]
  },
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "libocct-data-exchange-7.5"},
          {"reference": "libocct-data-exchange-dev"},
          {"reference": "libocct-doc"},
          {"reference": "libocct-draw-7.5"},
          {"reference": "libocct-draw-dev"},
          {"reference": "libocct-foundation-7.5"},
          {"reference": "libocct-foundation-dev"},
          {"reference": "libocct-modeling-algorithms-7.5"},
          {"reference": "libocct-modeling-algorithms-dev"},
          {"reference": "libocct-modeling-data-7.5"},
          {"reference": "libocct-modeling-data-dev"},
          {"reference": "libocct-ocaf-7.5"},
          {"reference": "libocct-ocaf-dev"},
          {"reference": "libocct-visualization-7.5"},
          {"reference": "libocct-visualization-dev"},
          {"reference": "occt-draw"},
          {"reference": "occt-misc"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "libocct-data-exchange-7.9"},
          {"reference": "libocct-data-exchange-dev"},
          {"reference": "libocct-doc"},
          {"reference": "libocct-draw-7.9"},
          {"reference": "libocct-draw-dev"},
          {"reference": "libocct-foundation-7.9"},
          {"reference": "libocct-foundation-dev"},
          {"reference": "libocct-ivtk-7.9"},
          {"reference": "libocct-ivtk-dev"},
          {"reference": "libocct-modeling-algorithms-7.9"},
          {"reference": "libocct-modeling-algorithms-dev"},
          {"reference": "libocct-modeling-data-7.9"},
          {"reference": "libocct-modeling-data-dev"},
          {"reference": "libocct-ocaf-7.9"},
          {"reference": "libocct-ocaf-dev"},
          {"reference": "libocct-visualization-7.9"},
          {"reference": "libocct-visualization-dev"},
          {"reference": "occt-draw"},
          {"reference": "occt-misc"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "libocct-data-exchange-7.8"},
          {"reference": "libocct-data-exchange-dev"},
          {"reference": "libocct-doc"},
          {"reference": "libocct-draw-7.8"},
          {"reference": "libocct-draw-dev"},
          {"reference": "libocct-foundation-7.8"},
          {"reference": "libocct-foundation-dev"},
          {"reference": "libocct-modeling-algorithms-7.8"},
          {"reference": "libocct-modeling-algorithms-dev"},
          {"reference": "libocct-modeling-data-7.8"},
          {"reference": "libocct-modeling-data-dev"},
          {"reference": "libocct-ocaf-7.8"},
          {"reference": "libocct-ocaf-dev"},
          {"reference": "libocct-visualization-7.8"},
          {"reference": "libocct-visualization-dev"},
          {"reference": "occt-draw"},
          {"reference": "occt-misc"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "opencascade"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "opencascade"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "opencascade"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "opencascade"}
        ]
      }
    ]
  }
};

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');
}