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CVE-2026-41686— Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool

Quick assessment

Affected
anthropics anthropic-sdk-typescript
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.

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。

AI Predicted 5.3 Difficulty: Easy EPSS 0.13% · P2

Possible ATT&CK Techniques 2 AI

T1005 · Data from Local System T1562

Affected Version Matrix 1

VendorProduct Version RangeStatus
anthropics anthropic-sdk-typescript >= 0.79.0, < 0.91.1 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
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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III. Intelligence Information for CVE-2026-41686

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Vendor Advisories for CVE-2026-41686 (1)

IV. Related Vulnerabilities

Same product: anthropic-sdk-typescript
Same vendor: anthropics
Same weakness: CWE-732

V. Comments for CVE-2026-41686

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