CVE-2026-106119
Received Received - Intake

MongoDBChatMessageHistory Session Identifier Injection

Publication date: 2026-10-06

Last updated on: 2026-10-06

Assigner: GitHub, Inc.

Description
LangChain is a framework for building LLM-powered applications. Prior to 1.3.1, MongoDBChatMessageHistory does not enforce the documented string type for an untrusted structured session identifier at runtime, allowing the identifier to be interpreted as a MongoDB query condition rather than as a literal value when multiple users' histories are stored in a shared MongoDB collection. An attacker able to invoke chat-history operations can read, modify, or delete another user's stored conversation. Applications using authenticated, server-controlled string identifiers are not affected. This issue is fixed in version 1.3.1.

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Meta Information

Published
2026-10-06
Last Modified
2026-10-06
Generated
2026-10-06
AI Q&A
2026-10-06
EPSS Evaluated
N/A
NVD
CVE-2026-106119
EUVD
EUVD-2026-93771

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
langchain-ai langchainjs < 1.5.14
@langchain mongodb < 1.3.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-943 The product generates a query intended to access or manipulate data in a data store such as a database, but it does not neutralize or incorrectly neutralizes special elements that can modify the intended logic of the query.

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Executive Summary

LangChain is a framework for building applications powered by large language models. This vulnerability affects the MongoDBChatMessageHistory component in versions before 1.3.1. It allows an attacker to manipulate the session identifier, which is supposed to be a simple string, into a MongoDB query condition. This can lead to unauthorized access to other users' stored chat histories in a shared MongoDB collection.

Impact Analysis

If you use LangChain with MongoDBChatMessageHistory in versions prior to 1.3.1, an attacker could read, modify, or delete your stored chat conversations. This could expose sensitive information shared during chats. Applications using server-controlled string identifiers are not affected.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR's data protection principles and HIPAA's requirements for safeguarding protected health information. Organizations using affected versions may face compliance violations and potential legal consequences.

Mitigation Strategies

Upgrade LangChain to version 1.3.1 or later to address the vulnerability in MongoDBChatMessageHistory.

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