CVE-2026-118667
Dashboard / Vulnerabilities / CVE-2026-118667
Summary: LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests
Details: 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.
References: https://github.com/langchain-ai/langgraph/releases/tag/1.2.14, https://github.com/langchain-ai/langgraph/releases/tag/sdk%3D%3D0.4.6, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118667.json, https://github.com/langchain-ai/langgraph/security/advisories/GHSA-3fx2-cqw9-xr3c, https://nvd.nist.gov/vuln/detail/CVE-2026-118667, https://github.com/langchain-ai/langgraph/commit/d89c7e100ec6fc1512544d23b0a7c5169699ef3e, https://github.com/langchain-ai/langgraph/pull/9213
Affected packages
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