Anthropic Claude Code 2.1.59 < 2.1.128 Information Disclosure (CVE-2026-46406)

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

include('compat.inc');

if (description)
{
  script_id(324950);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/06");

  script_cve_id("CVE-2026-46406");

  script_name(english:"Anthropic Claude Code 2.1.59 < 2.1.128 Information Disclosure (CVE-2026-46406)");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote host is affected by an
information disclosure vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Anthropic Claude Code installed on the remote host is
2.1.59 prior to 2.1.128. It is, therefore, affected by an information
disclosure vulnerability:

  - The Claude Code /copy command wrote responses to a hardcoded,
    predictable path (/tmp/claude/response.md) without UID isolation,
    randomness, or symlink protection. The file was created
    world-readable (0644) in a world-traversable directory (0755),
    allowing any local user to read a privileged user's Claude
    response, which could contain secrets or credentials.
    Additionally, because the path was static and predictable, a local
    attacker could pre-create the directory and plant a symlink at the
    expected file path, causing the privileged process to follow the
    symlink and overwrite an attacker-chosen file with the response
    text. (CVE-2026-46406)

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/anthropics/claude-code/security/advisories/GHSA-4vp2-6q8c-pvq2
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a5172a5f");
  script_set_attribute(attribute:"solution", value:
"Upgrade Anthropic Claude Code to version 2.1.128 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:P/I:P/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-46406");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:anthropic:claude_code");
  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("anthropic_claude_code_win_installed.nbin", "anthropic_claude_code_macos_installed.nbin", "anthropic_claude_code_nix_installed.nbin");
  script_require_keys("installed_sw/Anthropic Claude Code");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Anthropic Claude Code', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {
          'min_version': '2.1.59',
          'fixed_version': '2.1.128'
        }
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result:result);