CVE-2026-106119 · GHSA-m6rx-h84q-8r95
LangChain: MongoDBChatMessageHistory query injection can allow cross-session access
- Risk score
- 49/100
- CVSS
- 6.0 v4.0
- Exploit chance (30 days)
- 0.5%
- Published
- 6 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 mul…
- Affected
- @langchain/mongodb (npm) <= 1.3.0
- Fix
- Upgrade @langchain/mongodb to 1.3.1 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 6.0 medium
- On your watchlist: npm
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| @langchain/mongodb | npm | <= 1.3.0 | 1.3.1 |
References
- 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
- https://github.com/advisories/GHSA-m6rx-h84q-8r95
Original 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.
Last activity 6 Oct 2026. Patch Forecast updates every hour.