{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.4.0"
              },
              {
                "fixed": "0.3.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1816901a7ec3d760f72c11fda6804205a662faae"
            },
            {
              "fixed": "6047a6ee188d65ff3e576fc5a343a6896c4dea5c"
            },
            {
              "fixed": "14a6cc39e67d23fd409cd13a9caae2c329df0a09"
            },
            {
              "fixed": "240e7ecee432ea006d9fef6ea506bfd2e009a3f4"
            },
            {
              "fixed": "5465e4d3ea0ef5c88a666a6442bd853ff4bd70e5"
            }
          ],
          "repo": "https://github.com/langchain-ai/langchain-mongodb",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-533j-2v4q-mw5h"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-943"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55253.json"
  },
  "details": "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.",
  "id": "CVE-2026-55253",
  "modified": "2026-09-16T03:30:41.721843307Z",
  "published": "2026-09-14T17:09:04.088Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-checkpoint-mongodb/v0.4.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-store-mongodb/v0.3.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55253.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/langchain-ai/langchain-mongodb/security/advisories/GHSA-533j-2v4q-mw5h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55253"
    },
    {
      "type": "FIX",
      "url": "https://github.com/langchain-ai/langchain-mongodb/commit/14a6cc39e67d23fd409cd13a9caae2c329df0a09"
    },
    {
      "type": "FIX",
      "url": "https://github.com/langchain-ai/langchain-mongodb/commit/240e7ecee432ea006d9fef6ea506bfd2e009a3f4"
    },
    {
      "type": "FIX",
      "url": "https://github.com/langchain-ai/langchain-mongodb/commit/5465e4d3ea0ef5c88a666a6442bd853ff4bd70e5"
    },
    {
      "type": "FIX",
      "url": "https://github.com/langchain-ai/langchain-mongodb/pull/384"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "LangChain MongoDB: NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure"
}