---
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: 0.00531
epssPercentile: 0.42404
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55253)

Affected packages:

- `langgraph-checkpoint-mongodb < 0.3.0`
- `langgraph-store-mongodb < 0.4.0`

Patched in:

- `langgraph-checkpoint-mongodb 0.3.0`
- `langgraph-store-mongodb 0.4.0`

Source: https://osv.dev/vulnerability/GHSA-533j-2v4q-mw5h