| Component | LangChain |
| Severity | medium (CVSS 6) |
| CVSS vector | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| Published (NVD) | 2026-10-06 |
| Affected versions | < 1.3.1 read from the advisory text: NVD has not published CPE data yet |
| Fixed in | 1.3.1 |
| Weakness | CWE-943 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade LangChain to
1.3.1or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-106119
- https://github.com/langchain-ai/langchainjs/commit/946e3d856ff1f8ce7f7b9374c83f680a6ada79af
- https://github.com/langchain-ai/langchainjs/pull/11672
- https://github.com/langchain-ai/langchainjs/releases/tag/@langchain/[email protected]
- https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-m6rx-h84q-8r95
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