Python Library OpenEXR 3.3.x < 3.3.7 / 3.4.x < 3.4.5 Heap Buffer Overflow (OOB Read)

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

include('compat.inc');

if (description)
{
  script_id(301139);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/30");

  script_cve_id("CVE-2026-26981");
  script_xref(name:"IAVA", value:"2026-A-0206-S");

  script_name(english:"Python Library OpenEXR 3.3.x < 3.3.7 / 3.4.x < 3.4.5 Heap Buffer Overflow (OOB Read)");

  script_set_attribute(attribute:"synopsis", value:
"A Python library installed on the remote host is affected by a heap buffer overflow vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of the OpenEXR Python package installed on the remote host is 3.3.x prior to 3.3.7 or 3.4.x prior to
3.4.5. It is, therefore, affected by a heap buffer overflow vulnerability:

  - A heap-buffer-overflow (out-of-bounds read) occurs in the istream_nonparallel_read function in
    ImfContextInit.cpp when parsing a malformed EXR file through a memory-mapped IStream. A signed integer
    subtraction produces a negative value that is implicitly converted to size_t, resulting in a massive
    length being passed to memcpy. (CVE-2026-26981)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q6vj-wxvf-5m8c
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0a0a66ef");
  script_set_attribute(attribute:"solution", value:
"Upgrade to OpenEXR version 3.3.7, 3.4.5 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-26981");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/02/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"asset_categories", value:"component");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:academysoftwarefoundation:openexr");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  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("python_packages_installed_nix.nbin", "python_packages_win_installed.nbin");
  script_require_ports("Host/nix/Python/Packages/Enumerated", "Host/win/Python/Packages/Enumerated");

  exit(0);
}

include('python.inc');

var pkg = 'OpenEXR';

var libs = python::get_package_info(pkg_name:pkg, cpe:"cpe:/a:academysoftwarefoundation:openexr");

if (empty_or_null(libs))
  audit(AUDIT_NOT_INST, pkg);

vcf::check_all_backporting(app_info:libs);

var constraints = [
  { 'min_version' : '3.3.0' , 'fixed_version' : '3.3.7' },
  { 'min_version' : '3.4.0' , 'fixed_version' : '3.4.5' }
];

vcf::check_version_and_report(
  app_info:libs,
  constraints:constraints,
  severity:SECURITY_HOLE
);