Langflow < 1.0.19 DoS (CVE-2026-55446)

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

include('compat.inc');

if (description)
{
  script_id(326240);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/13");

  script_cve_id("CVE-2026-55446");

  script_name(english:"Langflow < 1.0.19 DoS (CVE-2026-55446)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Langflow installed on the remote host is prior to 1.0.19. It is, therefore,
affected by a denial of service vulnerability:

  - An attacker can send a /api/v1/files/upload/ request without any authentication and abuse
    a very long multipart form boundary to make the Langflow application unusable for all users
    for an indefinite amount of time. (CVE-2026-55446)

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/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c673d61e");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Langflow version 1.0.19 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:N/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-2026-55446");

  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:"2026/06/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/10/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/10");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:langflow:langflow");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Artificial Intelligence");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("python_langflow_detect.nasl", "langflow_web_detect.nbin");
  script_require_keys("installed_sw/Langflow");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Langflow', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {
          'fixed_version': '1.0.19'
        }
      ]
    }
  ]
};

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