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CVE-2026-104873

LangGraph SDK custom auth silently ignores actions= on resource decorators PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
langchain-ai / langgraphaffected >= 0.1.45, < 0.4.4

CWE

CWE-863

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.