LangChain-Core < 0.3.81 / 1.x < 1.2.5

#%NASL_MIN_LEVEL 80900

##
# Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(344295);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/10");

  script_cve_id("CVE-2025-68664");

  script_name(english:"LangChain-Core < 0.3.81 / 1.x < 1.2.5");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, 
a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not 
escape dictionaries with 'lc' keys when serializing free-form dictionaries. The 'lc' key is used internally by 
LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as 
a legitimate LangChain object during deserialization rather than plain user data. This issue has been 
patched in versions 0.3.81 and 1.2.5.

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/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5f73d9ab");
  script_set_attribute(attribute:"solution", value:
"Upgrade to LangChain-Core version 0.3.81, 1.2.5, or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:N");
  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:H/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-68664");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(502);

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/12/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:langchain:langchain-core");
  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_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 = 'langchain-core';
var cpe = 'cpe:/a:langchain:langchain-core';

var libs = python::get_package_info(pkg_name:pkg, cpe:cpe);

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

vcf::check_all_backporting(app_info:libs);

var constraints = [
  { 'min_version': '1.0', 'fixed_version' : '1.2.5' },
  { 'fixed_version' : '0.3.81' }
];

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