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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-jfj5-wrj9-63x4 langgraph-api: Incomplete assistant authorization in LangGraph Server run creation
Fixes

Solution

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Workaround

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History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
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.
Title langgraph-api: Incomplete assistant authorization in LangGraph Server run creation
Weaknesses CWE-285
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-14T16:42:03.499Z

Reserved: 2026-06-16T16:44:00.623Z

Link: CVE-2026-55236

cve-icon Vulnrichment

Updated: 2026-09-14T16:41:56.140Z

cve-icon NVD

Status : Received

Published: 2026-09-14T16:17:12.663

Modified: 2026-09-14T17:17:48.093

Link: CVE-2026-55236

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses