FKIE_CVE-2025-68665

Vulnerability from fkie_nvd - Published: 2025-12-23 23:15 - Updated: 2026-01-13 16:17
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
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
References
security-advisories@github.comhttps://github.com/langchain-ai/langchainjs/commit/e5063f9c6e9989ea067dfdff39262b9e7b6aba62Patch
security-advisories@github.comhttps://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcore%401.1.8Release Notes
security-advisories@github.comhttps://github.com/langchain-ai/langchainjs/releases/tag/langchain%401.2.3Release Notes
security-advisories@github.comhttps://github.com/langchain-ai/langchainjs/security/advisories/GHSA-r399-636x-v7f6Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-r399-636x-v7f6Vendor Advisory
Impacted products
Vendor Product Version
langchain langchain.js *
langchain langchain.js *
langchain langchain\/core *
langchain langchain\/core *
To clipboard 

{
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              "criteria": "cpe:2.3:a:langchain:langchain.js:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "79F6F9C9-7927-4C72-9F8F-63186F6D59A2",
              "versionEndExcluding": "0.3.37",
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          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s toJSON() method (and subsequently when string-ifying objects using JSON.stringify(). The method did not escape objects with \u0027lc\u0027 keys when serializing free-form data in kwargs. The \u0027lc\u0027 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"
    }
  ],
  "id": "CVE-2025-68665",
  "lastModified": "2026-01-13T16:17:22.673",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
          "version": "3.1"
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        "type": "Secondary"
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          "attackVector": "NETWORK",
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          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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        "impactScore": 5.2,
        "source": "nvd@nist.gov",
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  "published": "2025-12-23T23:15:45.097",
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      "tags": [
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      "tags": [
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-502"
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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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