{"id":"CVE-2026-55253","title":"LangChain MongoDB provides integrations between MongoDB, Atlas, LangChain, and LangGraph","summary":"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()…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","cwe":["CWE-943"],"vendor":"langchain-ai","product":"langchain-mongodb","affected":["langchain-mongodb < 0.4.0","langgraph-checkpoint-mongodb < 0.3.0","langgraph-store-mongodb < 0.4.0"],"patched":["langgraph-checkpoint-mongodb 0.3.0","langgraph-store-mongodb 0.4.0"],"published":"2026-09-14","updated":"2026-09-14","sourceUpdated":"2026-09-14T20:16:47.800","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55253","references":[{"url":"https://github.com/langchain-ai/langchain-mongodb/commit/14a6cc39e67d23fd409cd13a9caae2c329df0a09","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchain-mongodb/commit/240e7ecee432ea006d9fef6ea506bfd2e009a3f4","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchain-mongodb/commit/5465e4d3ea0ef5c88a666a6442bd853ff4bd70e5","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchain-mongodb/pull/384","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-checkpoint-mongodb/v0.4.0","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-store-mongodb/v0.3.0","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchain-mongodb/security/advisories/GHSA-533j-2v4q-mw5h","label":"security-advisories@github.com"},{"url":"https://github.com/langchain-ai/langchain-mongodb"},{"url":"https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs%2Flanggraph-checkpoint-mongodb%2Fv0.4.0"},{"url":"https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs%2Flanggraph-store-mongodb%2Fv0.3.0"},{"url":"https://pypi.org/project/langgraph-checkpoint-mongodb"},{"url":"https://github.com/advisories/GHSA-533j-2v4q-mw5h"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55253"},{"url":"https://pypi.org/project/langgraph-store-mongodb"}],"tags":["nvd","cve.org","osv","pip","ghsa"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-14T19:20:51.424583Z"},"aliases":["GHSA-533j-2v4q-mw5h","PYSEC-2026-3859","PYSEC-2026-3860"],"ecosystem":"pip","ingestedAt":"2026-08-20T17:59:05.792Z","epss":0.0039,"epssPercentile":0.32859,"slug":"CVE-2026-55253","body":"## Overview\n\nLangChain 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55253)\n\nAffected packages:\n\n- `langgraph-checkpoint-mongodb < 0.3.0`\n- `langgraph-store-mongodb < 0.4.0`\n\nPatched in:\n\n- `langgraph-checkpoint-mongodb 0.3.0`\n- `langgraph-store-mongodb 0.4.0`\n\nSource: https://osv.dev/vulnerability/GHSA-533j-2v4q-mw5h","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}