LangChain MongoDB: NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55253
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 18:17:55 UTC
Updated2026-09-14 20:16:47 UTC
DescriptionLangChain 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS: 0.003900000 probability, percentile 0.325600000 (date 2026-09-15)

Problem Types: CWE-943 | CWE-943 CWE-943: Improper Neutralization of Special Elements in Data Query Logic

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Langchain-ai Langchain-mongodb affected < 0.4.0 Not specified
CNA Langchain-ai Langgraph-checkpoint-mongodb affected < 0.3.0 Not specified
CNA Langchain-ai Langgraph-store-mongodb affected < 0.4.0 Not specified

References

ReferenceSourceLinkTags
github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-st... [email protected] github.com
github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-ch... [email protected] github.com
github.com/langchain-ai/langchain-mongodb/pull/384 [email protected] github.com
github.com/langchain-ai/langchain-mongodb/commit/5465e4d3ea0ef5c88a666a6... [email protected] github.com
github.com/langchain-ai/langchain-mongodb/commit/240e7ecee432ea006d9fef6... [email protected] github.com
github.com/langchain-ai/langchain-mongodb/security/advisories/GHSA-533j-... [email protected] github.com
github.com/langchain-ai/langchain-mongodb/commit/14a6cc39e67d23fd409cd13... [email protected] github.com
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