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

Quick assessment

Affected
langchain-ai langgraph
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LangGraph Python SDK 用于从 Python 应用程序连接到正在运行的 LangGraph API 服务器，管理助手（assistants）、线程（threads）并流式传输运行过程。在 langgraph-sdk 0.4.0 至 0.4.6 版本，以及当 RemoteGraph v3 流式传输功能使用了受影响版本的 langgraph-sdk 时（对应 langgraph 1.2.3 至 1.2.14 版本），同步和异步的 v3 流式传输辅助函数 和 会将由调用方控制的 和 值直接拼接到已认证的

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-118667

Vulnerability Information
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Vulnerability Title
LangGraph: Unencoded identifiers in LangGraph SDK v3 streaming can redirect authenticated GET requests
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langgraph >= 1.2.3, < 1.2.14 -
langchain-ai langgraph-sdk >= 0.4.0, < 0.4.6 -

II. Public POCs for CVE-2026-118667

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-118667

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Patches & Fixes for CVE-2026-118667 (2)

Vendor Advisories for CVE-2026-118667 (1)

Vendor Pages for CVE-2026-118667 (2)

IV. Related Vulnerabilities

Same product: langgraph
Same vendor: langchain-ai
Same weakness: CWE-22