FKIE_CVE-2025-68664

Vulnerability from fkie_nvd - Published: 2025-12-23 23:15 - Updated: 2026-01-13 15:58
Severity ?
9.3 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6accb8466c8Patch
security-advisories@github.comhttps://github.com/langchain-ai/langchain/commit/d9ec4c5cc78960abd37da79b0250f5642e6f0ce6Patch
security-advisories@github.comhttps://github.com/langchain-ai/langchain/pull/34455Issue Tracking, Patch
security-advisories@github.comhttps://github.com/langchain-ai/langchain/pull/34458Issue Tracking, Patch
security-advisories@github.comhttps://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D0.3.81Release Notes
security-advisories@github.comhttps://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.5Release Notes
security-advisories@github.comhttps://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cmExploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cmExploit, Vendor Advisory
Impacted products
Vendor Product Version
langchain langchain_core *
langchain langchain_core *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:langchain:langchain_core:*:*:*:*:*:python:*:*",
              "matchCriteriaId": "DC184324-6CF1-4F7A-B87F-6DD2120C3B3B",
              "versionEndExcluding": "0.3.81",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:langchain:langchain_core:*:*:*:*:*:python:*:*",
              "matchCriteriaId": "4298E953-ED96-49EC-8474-86095D560F2B",
              "versionEndExcluding": "1.2.5",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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\u0027s dumps() and dumpd() functions. The functions do not escape dictionaries with \u0027lc\u0027 keys when serializing free-form dictionaries. 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 versions 0.3.81 and 1.2.5."
    }
  ],
  "id": "CVE-2025-68664",
  "lastModified": "2026-01-13T15:58:23.373",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N",
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        "impactScore": 4.7,
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        "type": "Secondary"
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
          "version": "3.1"
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        "exploitabilityScore": 3.9,
        "impactScore": 4.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-12-23T23:15:44.933",
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-502"
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      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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