n8n Node.js Package 2.0.x < 2.37.7 / 2.38.x < 2.38.2 Persistent Storage Exhaustion (CVE-2026-86075)

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

include('compat.inc');

if (description)
{
  script_id(347979);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/18");

  script_cve_id("CVE-2026-86075");
  script_xref(name:"IAVB", value:"2026-B-0255");

  script_name(english:"n8n Node.js Package 2.0.x < 2.37.7 / 2.38.x < 2.38.2 Persistent Storage Exhaustion (CVE-2026-86075)");

  script_set_attribute(attribute:"synopsis", value:
"The n8n Node.js Package installed on the remote host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of the n8n Node.js Package installed on the remote host is 2.0.x prior to 2.37.7, or is 2.38.x prior to
2.38.2. It is, therefore, affected by a denial of service vulnerability:

  - n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the OAuth Dynamic Client
    Registration endpoint bounded redirect_uris but accepted arbitrarily large client_name and grant_types
    values. An unauthenticated remote caller could repeatedly persist oversized values in oauth_clients and
    exhaust database storage. The affected validation is in
    packages/cli/src/modules/oauth-server/oauth-server.service.ts, including MAX_CLIENT_NAME_LENGTH and
    MAX_GRANT_TYPES. This issue is fixed in versions 2.37.7 and 2.38.2. (CVE-2026-86075)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://github.com/n8n-io/n8n/security/advisories/GHSA-hh89-3r9w-qj3j");
  script_set_attribute(attribute:"solution", value:
"Upgrade to n8n Node.js Package version 2.37.7, 2.38.2 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_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-86075");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"asset_categories", value:"component");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:n8n:n8n");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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("nodejs_modules_win_installed.nbin", "nodejs_modules_linux_installed.nbin", "nodejs_modules_mac_installed.nbin");
  script_require_keys("Host/nodejs/modules/enumerated");

  exit(0);
}

include('vcf_extras_nodejs.inc');

get_kb_item_or_exit('Host/nodejs/modules/enumerated');

var app = 'n8n';
var app_info = vcf_extras::nodejs_modules::get_app_info(app:app);

if (empty_or_null(app_info))
  audit(AUDIT_NOT_INST, app);

var constraints = [
  {'min_version':'2.0.0', 'fixed_version':'2.37.7'},
  {'min_version':'2.38.0', 'fixed_version':'2.38.2'}
];

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