medium6.0
CVE-2026-106119
LangChain: MongoDBChatMessageHistory query injection can allow cross-session access
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @langchain/mongodb | <= 1.3.0 | 1.3.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-m6rx-h84q-8r95
- https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-m6rx-h84q-8r95
- https://nvd.nist.gov/vuln/detail/CVE-2026-106119
- https://github.com/langchain-ai/langchainjs/pull/11672
- https://github.com/langchain-ai/langchainjs/commit/946e3d856ff1f8ce7f7b9374c83f680a6ada79af
- https://github.com/langchain-ai/langchainjs/releases/tag/@langchain/mongodb@1.3.1