---
title: "CVE-2026-55253: LangChain MongoDB - NoSQL Injection"
description: "LangChain MongoDB prior to langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0 contains a NoSQL injection caused by improper filtering of keys prefixed with $ in filter dictionaries, letting authenticated attackers bypass tenant isolation and access other tenants' data, exploit requires authenticated caller controlling filter arguments."
url: https://panop.io/threat-heartbeat/CVE-2026-55253/
---

# CVE-2026-55253 LangChain MongoDB - NoSQL Injection

LangChain MongoDB prior to langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0 contains a NoSQL injection caused by improper filtering of keys prefixed with $ in filter dictionaries, letting authenticated attackers bypass tenant isolation and access other tenants' data, exploit requires authenticated caller controlling filter arguments.

CVSS base score 7.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.53% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-55253)

## Details

Type

NoSQL Injection

Impact

Nosql Injection, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Published

14 September 2026

Updated

15 October 2026

Weakness

[CWE-943](https://cwe.mitre.org/data/definitions/943.html)

## Vendor fix

Upgrade to langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-55253](https://nvd.nist.gov/vuln/detail/CVE-2026-55253)
- [https://github.com/langchain-ai/langchain-mongodb/commit/14a6cc39e67d23fd409cd13a9caae2c329df0a09](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/240e7ecee432ea006d9fef6ea506bfd2e009a3f4)
- [https://github.com/langchain-ai/langchain-mongodb/commit/5465e4d3ea0ef5c88a666a6442bd853ff4bd70e5](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/pull/384)
- [https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-checkpoint-mongodb/v0.4.0](https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-checkpoint-mongodb/v0.4.0)
- [https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-store-mongodb/v0.3.0](https://github.com/langchain-ai/langchain-mongodb/releases/tag/libs/langgraph-store-mongodb/v0.3.0)
- [https://github.com/langchain-ai/langchain-mongodb/security/advisories/GHSA-533j-2v4q-mw5h](https://github.com/langchain-ai/langchain-mongodb/security/advisories/GHSA-533j-2v4q-mw5h)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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