LangChain AI LangGraph up to 0.4.3 Authorization Decorators actions improper authorization

Summaryinfo

A vulnerability categorized as critical has been discovered in LangChain AI LangGraph up to 0.4.3. This vulnerability affects unknown code of the component Authorization Decorators. Executing a manipulation of the argument actions can lead to improper authorization. This vulnerability appears as CVE-2026-104873. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in LangChain AI LangGraph up to 0.4.3. This vulnerability affects an unknown functionality of the component Authorization Decorators. The manipulation of the argument actions with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

LangGraph Python SDK is used to connect to running LangGraph API servers, manage assistants, threads and stream runs from Python applications. From 0.1.45 until 0.4.4, the langgraph-sdk resource-scoped authorization decorators @auth.on.threads, @auth.on.assistants, and @auth.on.crons ignore the actions argument and register the selected handler for every action on the resource. Because that wildcard resource handler is selected before broader fallback handlers, an authenticated user may bypass fallback action, ownership, or permission checks and read, update, or delete another user's resource. Only Python deployments using actions on the affected decorators are vulnerable, and a deployment remains protected when the selected handler independently enforces all required checks for every action it receives. This issue is fixed in version 0.4.4.

The advisory is available at github.com. This vulnerability was named CVE-2026-104873 since 10/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 0.4.4 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• LangChain AI

Name

• LangGraph

Version

• 0.4.0
• 0.4.1
• 0.4.2
• 0.4.3

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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