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

Medium · CVSS 5.9 (CVSS 3.1)EPSS 0.26%, 17th percentilePublished Updated Assigner: GitHub_M

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.

Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N · CWE-285

Tracked companies

LangChain (LangSmith)

Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

langchain-ai: langgraph-api

References

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