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CVE-2026-55236— langgraph-api: Incomplete assistant authorization in LangGraph Server run creation

Quick assessment

Affected
langchain-ai langgraph-api
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.

langgraph-api 实现了 LangGraph API，用于快速开发和测试。在 0.10.0 版本之前，langgraph-api 在创建运行（run-creation）路径中，通过向 分派一个不完整的值来授权与运行关联的助手（assistant），而非使用直接读取和定时任务（cron）创建所用的 事件。 在那些仅注册了 、省略了 处理器且没有全局回退处理器的自定义资源处理器部署中，没有任何适用的处理器会提供所有者（owner）过滤条件，这使得低权限用户能够通过 或 引用其他用户的私有助手。运行创建的响应可

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-55236

Vulnerability Information
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Vulnerability Title
langgraph-api: Incomplete assistant authorization in LangGraph Server run creation
Source: CVE Program / CVE List V5
Vulnerability Description
langgraph-api implements the LangGraph API for rapid development and testing. Prior to 0.10.0, the langgraph-api run-creation path authorizes the assistant attached to a run by dispatching assistants.search with an incomplete value instead of the assistants.read event used by direct reads and cron creation. In deployments with custom resource handlers that register only assistants.read, omit an assistants.search handler, and have no global fallback handler, no applicable handler supplies an owner filter, allowing a low-privileged user to reference another user's private assistant through POST /runs or POST /threads/{thread_id}/runs. The run-creation response can disclose the private assistant's metadata, config, and context, and the run can execute using that assistant's configuration. Deployments without custom authorization handlers, or with an equivalent owner filter applied through a global handler or across all assistant events, are not affected. This issue is fixed in version 0.10.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langgraph-api < 0.10.0 -

II. Public POCs for CVE-2026-55236

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III. Intelligence Information for CVE-2026-55236

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Vendor Advisories for CVE-2026-55236 (1)

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

CVE-2026-55253 7.7 HIGH LangChain MongoDB: NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant
CVE-2026-55235 5.9 MEDIUM langgraph-api: Relative webhook targets in LangGraph Server can reach in-process routes wi

IV. Related Vulnerabilities

Same product: langgraph-api
Same vendor: langchain-ai
Same weakness: CWE-285

V. Comments for CVE-2026-55236

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