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CVE-2026-118668— LangGraph JavaScript custom authentication may permit cross-user Store access

Quick assessment

Affected
langchain-ai langgraph-api
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-api 实现了 LangGraph API，用于快速开发和测试。在版本 0.12 至 0.15.0 期间，JavaScript 或 TypeScript 的自定义认证 Store 授权处理器可能返回一个被重写的命名空间，该命名空间未能跨越运行时边界，且未在 Store 操作执行前应用。因此，当部署依赖命名空间重写来实现隔离时，已认证用户可以访问其他用户的 Store 命名空间，从而导致未经授权的读取、覆盖、搜索或删除操作。采用拒绝非法命名空间而非重写命名空间的 Python 自定义认证及处理器不

CVSS 8.6 · High
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I. Basic Information for CVE-2026-118668

Vulnerability Information
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Vulnerability Title
LangGraph JavaScript custom authentication may permit cross-user Store access
Source: CVE Program / CVE List V5
Vulnerability Description
langgraph-api implements the LangGraph API for rapid development and testing. From 0.1.2 until 0.15.0, JavaScript or TypeScript custom authentication Store authorization handlers can return a rewritten namespace that is not carried across the runtime boundary and applied before the Store operation. An authenticated user can therefore access another user's Store namespace when a deployment relies on namespace rewriting for isolation, allowing unauthorized reads, overwrites, searches, or deletions. Python custom authentication and handlers that reject unauthorized namespaces instead of rewriting them are not affected. This issue is fixed in version 0.15.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langgraph-api >= 0.1.2, < 0.15.0 -

II. Public POCs for CVE-2026-118668

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III. Intelligence Information for CVE-2026-118668

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Other References for CVE-2026-118668 (1)

IV. Related Vulnerabilities

Same product: langgraph-api
Same vendor: langchain-ai
Same weakness: CWE-639