---
id: CVE-2026-48121
title: >-
  @langchain/langgraph-checkpoint-mongodb provides a LangGraph.js
  CheckpointSaver implementation that uses MongoDB for storage
summary: >-
  @langchain/langgraph-checkpoint-mongodb provides a LangGraph.js
  CheckpointSaver implementation that uses MongoDB for storage. Versions 1.3.0
  and below are vulnerable to NoSQL injection: checkpoint identifiers
  (thread_id, checkpoint_ns, c…
severity: medium
cvss: 6.7
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-943
vendor: langchain
product: '@langchain/langgraph-checkpoint-mongodb'
affected:
  - '@langchain/langgraph-checkpoint-mongodb <= 1.3.0'
patched:
  - '@langchain/langgraph-checkpoint-mongodb 1.3.1'
published: '2026-08-04'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:50:00.950'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48121'
references:
  - url: >-
      https://github.com/langchain-ai/langgraphjs/commit/284226c7ca164b3c81fe2d9e32b10f1fc6b99a3c
    label: security-advisories@github.com
  - url: 'https://github.com/langchain-ai/langgraphjs/issues/2351'
    label: security-advisories@github.com
  - url: >-
      https://github.com/langchain-ai/langgraphjs/security/advisories/GHSA-98xf-r82g-9mhx
    label: security-advisories@github.com
  - url: 'https://github.com/langchain-ai/langgraphjs/pull/2397'
  - url: 'https://github.com/advisories/GHSA-98xf-r82g-9mhx'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00355
epssPercentile: 0.26447
aliases:
  - GHSA-98xf-r82g-9mhx
ecosystem: npm
ingestedAt: '2026-07-07T15:41:59.269Z'
---

## Overview

@langchain/langgraph-checkpoint-mongodb provides a LangGraph.js CheckpointSaver implementation that uses MongoDB for storage. Versions 1.3.0 and below are vulnerable to NoSQL injection: checkpoint identifiers (thread_id, checkpoint_ns, checkpoint_id) from config.configurable are passed into MongoDB find() queries in MongoDBSaver.getTuple() without type enforcement. If an attacker supplies an object payload (such as MongoDB operators $gt or $ne) instead of a string, it can be interpreted as a query operator, bypassing thread scoping and leaking checkpoints, including pending writes, across tenants. Applications are at risk if they forward untrusted input into config.configurable without coercing it to strings or validating it against a schema, particularly in multi-tenant or user-isolated setups. Apps that only use server-issued, string-typed identifiers with schema validation rejecting non-string fields are not affected. This issue has been fixed in version 1.3.1.

## Remediation

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

## Package advisory (CVE-2026-48121)

Affected packages:

- `@langchain/langgraph-checkpoint-mongodb <= 1.3.0`

Patched in:

- `@langchain/langgraph-checkpoint-mongodb 1.3.1`

Source: https://github.com/advisories/GHSA-98xf-r82g-9mhx