CVE-2026-104873

HighCVSS 7.6

Published: 02/10/2026(UTC)Updated: 06/10/2026(UTC)Translated: 03/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.25%

15th percentile - higher than 15% of all known CVEs

Summary

LangGraph Python SDK (langgraph-sdk) from 0.1.45 to 0.4.4 contains a vulnerability in the resource-scoped authorization decorators @auth.on.threads, @auth.on.assistants, and @auth.on.crons. These decorators ignore the actions argument and register the selected handler for every action on the resource. Because the wildcard handler is selected before broader fallback handlers, an authenticated user may bypass ownership and permission checks and read, update, or delete another user's resource. Only Python deployments using actions on the affected decorators are vulnerable. Fixed in version 0.4.4.

Risk Assessment

The vulnerability allows unauthorized access to other users' resources, potentially compromising data confidentiality and integrity in LangGraph-based applications.

Recommendation

Upgrade langgraph-sdk to version 0.4.4 or later. If upgrading is not possible, ensure each handler independently enforces all required checks for every action it receives.

Other vulnerabilities in LangGraph SDK

CVE-2026-118667Medium
From langgraph-sdk 0.4.0 until 0.4.6, and from langgraph 1.2.3 until 1.2.14 when RemoteGraph v3 streaming uses an affected langgraph-sdk version, the synchronous and asynchronous v3 stream get_tree and _fetch_state helpers interpolate caller-controlled assistant_id and thread_id values into authenticated GET request paths without using _quote_path_param. Relative path segments can therefore be normalized into another readable path on the configured server while retaining authentication headers.

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS