LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-68664
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-23 23:15:44 UTC
Updated2026-10-19 22:10:00 UTC
DescriptionLangChain 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Problem Types: CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
3.1[email protected]Secondary9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
3.1CNADECLARED9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Langchain Langchain Core All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Langchain-ai Langchain affected >= 1.0.0, < 1.2.5 Not specified
CNA Langchain-ai Langchain affected < 0.3.81 Not specified

References

ReferenceSourceLinkTags
github.com/langchain-ai/langchain/commit/d9ec4c5cc78960abd37da79b0250f56... [email protected] github.com Patch
github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6a... [email protected] github.com Patch
github.com/langchain-ai/langchain/pull/34455 [email protected] github.com Issue Tracking, Patch
github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Vendor Advisory
github.com/langchain-ai/langchain/pull/34458 [email protected] github.com Issue Tracking, Patch
github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.5 [email protected] github.com Release Notes
github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D0.3.81 [email protected] github.com Release Notes
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