CVE-2026-41686— Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool
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I. Basic Information for CVE-2026-41686
Vulnerability Information
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Vulnerability Title
Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool
Source: NVD (National Vulnerability Database)
Vulnerability Description
Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications. From version 0.79.0 to before version 0.91.1, the BetaLocalFilesystemMemoryTool in the Anthropic TypeScript SDK created memory files and directories using the Node.js default modes (0o666 for files, 0o777 for directories), leaving them world-readable on systems with a standard umask and world-writable in environments with a permissive umask such as many Docker base images. A local attacker on a shared host could read persisted agent state, and in containerized deployments could modify memory files to influence subsequent model behavior. This issue has been patched in version 0.91.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键资源的不正确权限授予
Source: NVD (National Vulnerability Database)
Vulnerability Title
Claude SDK for TypeScript 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Claude SDK for TypeScript是Anthropic开源的一个用于调用Claude API的TypeScript软件开发工具包。 Claude SDK for TypeScript 0.79.0版本至0.91.1之前版本存在安全漏洞，该漏洞源于BetaLocalFilesystemMemoryTool使用Node.js默认模式创建内存文件和目录，可能导致本地攻击者读取持久化代理状态或修改内存文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| anthropics | anthropic-sdk-typescript | >= 0.79.0, < 0.91.1 | - |
II. Public POCs for CVE-2026-41686
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|---|
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IV. Related Vulnerabilities
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Claude SDK for Python: Insecure Default File Permissions in
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V. Comments for CVE-2026-41686
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