{
 "id": "CVE-2026-55253",
 "description": "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.",
 "published": "2026-09-14",
 "last_modified": "2026-09-30",
 "vuln_status": "Awaiting Analysis",
 "cna": "security-advisories@github.com",
 "cvss": {
  "version": "3.1",
  "score": 7.7,
  "severity": "HIGH",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
  "source": "security-advisories@github.com"
 },
 "cwe": [
  "CWE-943"
 ],
 "products": [
  {
   "vendor": "LangChain",
   "product": "LangChain",
   "versions_affected": null,
   "fixed_in": null,
   "product_id": "langchain"
  },
  {
   "vendor": "LangChain",
   "product": "LangGraph",
   "versions_affected": null,
   "fixed_in": null,
   "product_id": "langgraph"
  }
 ],
 "category": "framework",
 "surface": [],
 "kev": null,
 "fix": {
  "status": "unknown",
  "version": null,
  "url": null
 },
 "references": [
  {
   "url": "https://github.com/langchain-ai/langchain-mongodb/commit/14a6cc39e67d23fd409cd13a9caae2c329df0a09",
   "source": "security-advisories@github.com",
   "tags": []
  },
  {
   "url": "https://github.com/langchain-ai/langchain-mongodb/commit/240e7ecee432ea006d9fef6ea506bfd2e009a3f4",
   "source": "security-advisories@github.com",
   "tags": []
  },
  {
   "url": "https://github.com/langchain-ai/langchain-mongodb/commit/5465e4d3ea0ef5c88a666a6442bd853ff4bd70e5",
   "source": "security-advisories@github.com",
   "tags": []
  },
  {
   "url": "https://github.com/langchain-ai/langchain-mongodb/pull/384",
   "source": "security-advisories@github.com",
   "tags": []
  },
  {
   "url": "https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-checkpoint-mongodb/v0.4.0",
   "source": "security-advisories@github.com",
   "tags": []
  },
  {
   "url": "https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-store-mongodb/v0.3.0",
   "source": "security-advisories@github.com",
   "tags": []
  },
  {
   "url": "https://github.com/langchain-ai/langchain-mongodb/security/advisories/GHSA-533j-2v4q-mw5h",
   "source": "security-advisories@github.com",
   "tags": []
  }
 ],
 "related_agents": [
  "langchain-langchain",
  "langchain-langchain-deep-agents",
  "langchain-langgraph"
 ],
 "related_incidents": [],
 "match": {
  "tests": [
   "A:cpe"
  ],
  "terms": [
   "langchain:langchain:langchain",
   "langgraph:langchain:langgraph"
  ]
 },
 "status": "candidate",
 "note": null,
 "reviewer": null,
 "checked_on": null,
 "retrieved_on": "2026-10-25"
}