CVE-2026-118667: LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests
The LangGraph Python SDK v3 streaming client interpolates caller-supplied thread_id and assistant_id values into request paths without encoding them at four synchronous and asynchronous call sites. Relative path segments can therefore redirect an authenticated GET request to another path on the same configured server.
References
- github.com/advisories/GHSA-3fx2-cqw9-xr3c
- github.com/langchain-ai/langgraph/commit/d89c7e100ec6fc1512544d23b0a7c5169699ef3e
- github.com/langchain-ai/langgraph/pull/9213
- github.com/langchain-ai/langgraph/releases/tag/1.2.14
- github.com/langchain-ai/langgraph/releases/tag/sdk%3D%3D0.4.6
- github.com/langchain-ai/langgraph/security/advisories/GHSA-3fx2-cqw9-xr3c
- nvd.nist.gov/vuln/detail/CVE-2026-118667
Code Behaviors & Features
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