CVE-2026-104873 (GCVE-0-2026-104873)

Vulnerability from cvelistv5 – Published: 2026-10-02 20:06 – Updated: 2026-10-02 20:06
VLAI
Title
LangGraph SDK custom auth silently ignores actions= on resource decorators
Summary
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.
Severity
7.6 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version CPE status
langchain-ai langgraph Affected: >= 0.1.45, < 0.4.4
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      "title": "LangGraph SDK custom auth silently ignores actions= on resource decorators"
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      "product_status:known_affected": "8",
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      "title": "langgraph-sdk: langgraph-sdk: Authorization bypass via improper resource handler registration",
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}



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