CVE Tools
Sign in

CVE-2025-68665

LangChain serialization injection vulnerability enables secret extraction

Published: Dec 23, 2025Updated: Jan 13, 2026 Sources: CVE List NVD GHSACWE-502
8.6HIGH
NVD MITRE
EPSS Score
0.8%
Top 48.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-502

Affected Products

langchain
oss-projectaka langchain-experimental, langchain core
langchain.jsLibrary
AI / ML / ml-framework
langchain\/coreLibrary
AI / ML / ml-framework
npm
package-ecosystem
@langchain/core
OSS Libraries
langchain
OSS Libraries
langchain-ai
oss-projectaka langchain, langgraph, langchain-ai/langchain
langchainjsMixed
AI / ML / ai-agent-tooling

Exploitability

Official Patch Available
Is your org exposed to CVE-2025-68665?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

3 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/langchain-ai/langchainjs/commit/e5063f9c6e9989ea067dfdff39262b9e7b6aba62
github.com
https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcore%401.1.8
github.com
https://github.com/langchain-ai/langchainjs/releases/tag/langchain%401.2.3
github.com
and 3 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2025-68665 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows