{"cve":"CVE-2026-55253","nvd":{"published":"2026-09-14T18:17:55.500","modified":"2026-09-30T17:43:24.057","status":"Awaiting Analysis","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","score":7.7},"cwes":["CWE-943"],"references":["https://github.com/langchain-ai/langchain-mongodb/commit/14a6cc39e67d23fd409cd13a9caae2c329df0a09","https://github.com/langchain-ai/langchain-mongodb/commit/240e7ecee432ea006d9fef6ea506bfd2e009a3f4","https://github.com/langchain-ai/langchain-mongodb/commit/5465e4d3ea0ef5c88a666a6442bd853ff4bd70e5","https://github.com/langchain-ai/langchain-mongodb/pull/384","https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-checkpoint-mongodb/v0.4.0"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-55253","score":0.00531,"percentile":0.44611,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-533j-2v4q-mw5h","url":"https://osv.dev/vulnerability/GHSA-533j-2v4q-mw5h","summary":"LangChain MongoDB has NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure","modified":"2026-09-10T12:26:05.292311514Z","packages":[{"ecosystem":"PyPI","name":"langgraph-checkpoint-mongodb","purl":"pkg:pypi/langgraph-checkpoint-mongodb","ranges":["<0.3.0"],"fixed":["0.3.0"]},{"ecosystem":"PyPI","name":"langgraph-store-mongodb","purl":"pkg:pypi/langgraph-store-mongodb","ranges":["<0.4.0"],"fixed":["0.4.0"]}]},{"id":"PYSEC-2026-3859","url":"https://osv.dev/vulnerability/PYSEC-2026-3859","summary":"LangChain MongoDB has NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure","modified":"2026-09-10T12:26:05.292311514Z","packages":[{"ecosystem":"PyPI","name":"langgraph-checkpoint-mongodb","purl":"pkg:pypi/langgraph-checkpoint-mongodb","ranges":["<0.3.0"],"fixed":["0.3.0"]}]},{"id":"PYSEC-2026-3860","url":"https://osv.dev/vulnerability/PYSEC-2026-3860","summary":"LangChain MongoDB has NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure","modified":"2026-09-10T12:26:05.292311514Z","packages":[{"ecosystem":"PyPI","name":"langgraph-store-mongodb","purl":"pkg:pypi/langgraph-store-mongodb","ranges":["<0.4.0"],"fixed":["0.4.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}