Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/langchain-ai/langgraph/commit/5a77be5e8bec1600ad0a865638d88c1
- https://github.com/langchain-ai/langgraph/releases/tag/sdk==0.4.4
- https://github.com/langchain-ai/langgraph/security/advisories/GHSA-fvww-7h3r-vfh
FAQ
What is CVE-2026-104873?
CVE-2026-104873 is a documented vulnerability. 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-scope...
How severe is CVE-2026-104873?
CVSS scoring is not yet available for CVE-2026-104873. Check NVD for updates.
Is there a patch for CVE-2026-104873?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.