CVE-2025-68665

CRITICAL EPSS 50.2%
Published Dec 23, 20256mo ago · Modified Jun 17, 20261w ago
9.1 CVSS 3.1
Critical
Find Similar
Published Dec 23, 2025 6mo ago
Last Modified Jun 17, 2026 1w ago

Description

LangChain is a framework for building LLM-powered applications. Prior to @langchain/core versions 0.3.80 and 1.1.8, and prior to langchain versions 0.3.37 and 1.2.3, a serialization injection vulnerability exists in LangChain JS's toJSON() method (and subsequently when string-ifying objects using JSON.stringify(). The method did not escape objects with 'lc' keys when serializing free-form data in kwargs. 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 @langchain/core versions 0.3.80 and 1.1.8, and langchain versions 0.3.37 and 1.2.3

CVSS Details

Base Score
9.1
Exploitability
3.9
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
50.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-502 Deserialization of Untrusted Data Validation

Affected Products 4

VendorProductVersionRange
langchainlangchain.js* <0.3.37
langchainlangchain.js*≥1.0.0  –  <1.2.3
langchainlangchain\/core* <0.3.80
langchainlangchain\/core*≥1.0.0  –  <1.1.8

References 4

  • github.com https://github.com/langchain-ai/langchainjs/commit/e5063f9c6e9989ea067dfdff39262b9e7b6aba62
    Patch
  • github.com https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcore%401.1.8
    Release Notes
  • github.com https://github.com/langchain-ai/langchainjs/releases/tag/langchain%401.2.3
    Release Notes
  • github.com https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-r399-636x-v7f6
    Vendor Advisory

Remediation

  • github.com https://github.com/langchain-ai/langchainjs/commit/e5063f9c6e9989ea067dfdff39262b9e7b6aba62
    Patch