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CVE-2026-104873— LangGraph SDK custom auth silently ignores actions= on resource decorators

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 用于连接正在运行的 LangGraph API 服务器，管理助手（assistants）、线程（threads）并从 Python 应用中流式获取运行结果。在版本 0.1.45 至 0.4.4 之间，langgraph-sdk 中资源级授权装饰器 、 和 忽略了 参数，并将所选处理程序注册到该资源上的所有操作。由于这个通配符资源处理程序优先于更宽泛的回退（fallback）处理程序被选中，经过身份验证的用户可能绕过回退操作、所有权或权限检查，从而读取、更新或删除其他用户的资

CVSS 7.6 · High EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
langchain-ai langgraph >= 0.1.45, < 0.4.4 affected
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I. Basic Information for CVE-2026-104873

Vulnerability Information
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Vulnerability Title
LangGraph SDK custom auth silently ignores actions= on resource decorators
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 0.1.45 until 0.4.4, the langgraph-sdk resource-scoped authorization decorators @auth.on.threads, @auth.on.assistants, and @auth.on.crons ignore the actions argument and register the selected handler for every action on the resource. Because that wildcard resource handler is selected before broader fallback handlers, an authenticated user may bypass fallback action, ownership, or permission checks and read, update, or delete another user's resource. Only Python deployments using actions on the affected decorators are vulnerable, and a deployment remains protected when the selected handler independently enforces all required checks for every action it receives. This issue is fixed in version 0.4.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langgraph >= 0.1.45, < 0.4.4 -

II. Public POCs for CVE-2026-104873

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III. Intelligence Information for CVE-2026-104873

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Patches & Fixes for CVE-2026-104873 (1)

Vendor Advisories for CVE-2026-104873 (1)

Vendor Pages for CVE-2026-104873 (1)

IV. Related Vulnerabilities

Same product: langgraph
Same vendor: langchain-ai
Same weakness: CWE-863

V. Comments for CVE-2026-104873

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