Anthropic Claude Code < 2.1.179 Plugin Hash Pinning Bypass (CVE-2026-86063)

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

include('compat.inc');

if (description)
{
  script_id(370432);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/23");

  script_cve_id("CVE-2026-86063");

  script_name(english:"Anthropic Claude Code < 2.1.179 Plugin Hash Pinning Bypass (CVE-2026-86063)");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote host is affected by a code
integrity check bypass vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Anthropic Claude Code installed on the remote host is prior to 2.1.179. It is, therefore, affected by a
  hash pinning bypass vulnerability:

  - The plugin install flow in Claude Code checked out a marketplace's pinned commit SHA using git
    checkout without verifying that the resulting HEAD matched the pinned SHA. An attacker controlling
    a plugin's upstream repository could create a branch named identically to the pinned 40-character
    SHA, causing the checkout to silently resolve to the attacker's branch tip instead of the reviewed
    commit, resulting in attacker-controlled code being installed and bypassing the pinned hash.
    Exploitation required a user to install a malicious plugin, pin it to a safe hash, and for the plugin
    source to be hosted on a git host that permitted SHA-shaped branch names. (CVE-2026-86063)

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-pq7j-f95f-qfcv
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cbb9a270");
  script_set_attribute(attribute:"see_also", value:"https://github.com/anthropics/claude-code/releases/tag/v2.1.179");
  script_set_attribute(attribute:"solution", value:
"Upgrade Anthropic Claude Code to version 2.1.179 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  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:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/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-2026-86063");

  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:"2026/10/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/22");

  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': [
        {
          'fixed_version': '2.1.179'
        }
      ]
    }
  ]
};

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