CVE-2026-118667 - LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests

CVE-2026-118667 - LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests

https://cvefeed.io/rssfeed/latest.atom / Thu, 10/29/2026 - 01:12
CVE ID :CVE-2026-118667
Published : Oct. 28, 2026, 9:16 p.m. | 1 hour, 6 minutes ago
Description :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.
Severity: 4.3 | MEDIUM
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