CVE-2026-118667

MediumCVSS 4.3

Published: 28/10/2026(UTC)Updated: 29/10/2026(UTC)Translated: 28/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.39%

34th percentile - higher than 34% of all known CVEs

Summary

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.

Risk Assessment

Potential unauthorized access to other resources on the LangGraph server using the victim's credentials, leading to confidentiality and integrity breaches.

Recommendation

Update langgraph-sdk to version 0.4.6 or later and langgraph to version 1.2.14 or later. Ensure path parameters are properly encoded.

Other vulnerabilities in langgraph-sdk

CVE-2026-104873High
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.

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 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. This issue is fixed in langgraph-sdk 0.4.6 and langgraph 1.2.14.

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