CVE-2025-68665

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 v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

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

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:langchain:langchain.js::::::::
	cpe:2.3:a:langchain:langchain.js::::::::
	cpe:2.3:a:langchain:langchain\/core::::::node.js::*
	cpe:2.3:a:langchain:langchain\/core::::::node.js::*

History

No history.

Information

Published : 2025-12-23 23:15

Updated : 2026-01-13 16:17

NVD link : CVE-2025-68665

Mitre link : CVE-2025-68665

CVE.ORG link : CVE-2025-68665

JSON object : View

Products Affected

langchain

langchain\/core
langchain.js

CWE

CWE-502

Deserialization of Untrusted Data

{"id": "CVE-2025-68665", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.6, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 4.0, "exploitabilityScore": 3.9}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "published": "2025-12-23T23:15:45.097", "references": [{"url": "https://github.com/langchain-ai/langchainjs/commit/e5063f9c6e9989ea067dfdff39262b9e7b6aba62", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcore%401.1.8", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/langchain-ai/langchainjs/releases/tag/langchain%401.2.3", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-r399-636x-v7f6", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-r399-636x-v7f6", "tags": ["Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-502"}]}], "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'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"}], "lastModified": "2026-01-13T16:17:22.673", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:langchain:langchain.js:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "79F6F9C9-7927-4C72-9F8F-63186F6D59A2", "versionEndExcluding": "0.3.37"}, {"criteria": "cpe:2.3:a:langchain:langchain.js:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "32341D52-B3FD-484F-940F-CB8EB24CFB43", "versionEndExcluding": "1.2.3", "versionStartIncluding": "1.0.0"}, {"criteria": "cpe:2.3:a:langchain:langchain\\/core:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "7D44DA1A-0433-4A46-8E85-D8363F1E5C99", "versionEndExcluding": "0.3.80"}, {"criteria": "cpe:2.3:a:langchain:langchain\\/core:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "CECC1942-DCA4-42B5-B9C1-E2F420B27D9A", "versionEndExcluding": "1.1.8", "versionStartIncluding": "1.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}