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CVE-2026-55253— LangChain MongoDB: NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure

Quick assessment

Affected
langchain-ai langchain-mongodb
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LangChain MongoDB是LangChain公司的一款面向大语言模型应用的数据库集成工具，支持向量存储、聊天记录持久化与缓存管理。 LangChain MongoDB存在输入验证错误漏洞，该漏洞源于MongoDBSaver.list()、MongoDBSaver.alist()和MongoDBStore.search()将过滤字典合并到MongoDB查询中，未递归拒绝以$开头的键，经过身份验证的调用者可通过HTTP查询参数、请求体字段或代理工具参数控制filter参数并注入$regex或$whe

CVSS 7.7 · High EPSS 0.53% · P45

Affected Version Matrix 3

VendorProduct Version RangeStatus
langchain-ai langchain-mongodb < 0.4.0 affected
langchain-ai langgraph-checkpoint-mongodb < 0.3.0 affected
langchain-ai langgraph-store-mongodb < 0.4.0 affected
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I. Basic Information for CVE-2026-55253

Vulnerability Information
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Vulnerability Title
LangChain MongoDB: NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure
Source: CVE Program / CVE List V5
Vulnerability 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 $where. In a multi-tenant deployment that uses the filter to enforce per-user or per-tenant isolation, injected operators can bypass intended equality filtering and expose other tenants' checkpoint or store data. Filters constructed entirely from trusted server-side values have lower practical risk. This issue is fixed in langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
数据查询逻辑中特殊元素的不当中和
Source: CVE Program / CVE List V5
Vulnerability Title
LangChain MongoDB 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LangChain MongoDB是LangChain公司的一款面向大语言模型应用的数据库集成工具，支持向量存储、聊天记录持久化与缓存管理。 LangChain MongoDB存在输入验证错误漏洞，该漏洞源于MongoDBSaver.list()、MongoDBSaver.alist()和MongoDBStore.search()将过滤字典合并到MongoDB查询中，未递归拒绝以$开头的键，经过身份验证的调用者可通过HTTP查询参数、请求体字段或代理工具参数控制filter参数并注入$regex或$whe
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langchain-mongodb < 0.4.0 -
langchain-ai langgraph-checkpoint-mongodb < 0.3.0 -
langchain-ai langgraph-store-mongodb < 0.4.0 -

II. Public POCs for CVE-2026-55253

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III. Intelligence Information for CVE-2026-55253

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Patches & Fixes for CVE-2026-55253 (5)

Vendor Advisories for CVE-2026-55253 (1)

Vendor Pages for CVE-2026-55253 (1)

Same Patch Batch · langchain-ai · 2026-09-14 · 3 CVEs total

CVE-2026-55235 5.9 MEDIUM langgraph-api: Relative webhook targets in LangGraph Server can reach in-process routes wi
CVE-2026-55236 5.9 MEDIUM langgraph-api: Incomplete assistant authorization in LangGraph Server run creation

IV. Related Vulnerabilities

Same vendor: langchain-ai
Same weakness: CWE-943