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CVE-2026-34451— Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories

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 0.81.0之前版本存在安全漏洞，该漏洞源于本地文件系统内存工具对模型提供路径的验证不足，可能导致路径遍历攻击。

AI Predicted 8.8 Difficulty: Easy EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-34451

Vulnerability Information
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Vulnerability Title
Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories
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 0.81.0, the local filesystem memory tool in the Anthropic TypeScript SDK validated model-supplied paths using a string prefix check that did not append a trailing path separator. A model steered by prompt injection could supply a crafted path that resolved to a sibling directory sharing the memory root's name as a prefix, allowing reads and writes outside the sandboxed memory directory. This issue has been patched in version 0.81.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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
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 0.81.0之前版本存在安全漏洞，该漏洞源于本地文件系统内存工具对模型提供路径的验证不足，可能导致路径遍历攻击。
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, < 0.81.0 -

II. Public POCs for CVE-2026-34451

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III. Intelligence Information for CVE-2026-34451

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Patches & Fixes for CVE-2026-34451 (1)

Vendor Advisories for CVE-2026-34451 (1)

Same Patch Batch · anthropics · 2026-03-31 · 3 CVEs total

CVE-2026-34452 Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape
CVE-2026-34450 Claude SDK for Python: Insecure Default File Permissions in Local Filesystem Memory Tool

IV. Related Vulnerabilities

Same product: anthropic-sdk-typescript
Same vendor: anthropics
Same weakness: CWE-22

V. Comments for CVE-2026-34451

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