CVE-2026-55253LangChain MongoDB: NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure
Updated under an hour ago ()
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It affects langchain-ai langchain-mongodb and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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LangChain MongoDB provides integrations between MongoDB, Atlas, LangChain, and LangGraph. Prior to langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0, MongoDBSaver.list(), MongoDBSaver.alist(), and MongoDBStore.search() incorporate filter dictionaries into MongoDB queries without recursively rejecting keys prefixed with $. An authenticated caller who controls a filter argument through HTTP query parameters, request body fields, or agent tool arguments can inject MongoDB Query Language operators such as $regex or $where. In a multi-tenant deployment that uses the filter to enforce per-user or per-tenant isolation, injected operators can bypass intended equality filtering and expose other tenants' checkpoint or store data. Filters constructed entirely from trusted server-side values have lower practical risk. This issue is fixed in langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0.
- CVSS
- 7.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- Weakness (CWE)
- CWE-943
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
langchain-ai langchain-mongodb langchain_ai:langchain_mongodb (from the name) | before 0.4.0 | CNA record |
langchain-ai langgraph-checkpoint-mongodb langchain_ai:langgraph_checkpoint_mongodb (from the name) | before 0.3.0 | CNA record |
langchain-ai langgraph-store-mongodb langchain_ai:langgraph_store_mongodb (from the name) | before 0.4.0 | CNA record |
References
- https://github.com/langchain-ai/langchain-mongodb/security/advisories/GHSA-533j-2v4q-mw5hx-refsource-confirm
- https://github.com/langchain-ai/langchain-mongodb/pull/384x-refsource-misc
- https://github.com/langchain-ai/langchain-mongodb/commit/14a6cc39e67d23fd409cd13a9caae2c329df0a09x-refsource-misc
- https://github.com/langchain-ai/langchain-mongodb/commit/240e7ecee432ea006d9fef6ea506bfd2e009a3f4x-refsource-misc
- https://github.com/langchain-ai/langchain-mongodb/commit/5465e4d3ea0ef5c88a666a6442bd853ff4bd70e5x-refsource-misc
- https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-checkpoint-mongodb/v0.4.0x-refsource-misc
- https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-store-mongodb/v0.3.0x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.