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CVE-2026-34450— Claude SDK for Python: Insecure Default File Permissions in Local Filesystem Memory Tool

Quick assessment

Affected
anthropics anthropic-sdk-python
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 Python是Anthropic开源的一个用于调用Claude API的Python软件开发工具包。 Claude SDK for Python 0.87.0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创建的文件权限不当，可能导致本地攻击者读取或修改代理状态。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.12% · P2
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I. Basic Information for CVE-2026-34450

Vulnerability Information
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Vulnerability Title
Claude SDK for Python: Insecure Default File Permissions in Local Filesystem Memory Tool
Source: CVE Program / CVE List V5
Vulnerability Description
The Claude SDK for Python provides access to the Claude API from Python applications. From version 0.86.0 to before version 0.87.0, the local filesystem memory tool in the Anthropic Python SDK created memory files with mode 0o666, 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. Both the synchronous and asynchronous memory tool implementations were affected. This issue has been patched in version 0.87.0.
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
缺省权限不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Claude SDK for Python 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Claude SDK for Python是Anthropic开源的一个用于调用Claude API的Python软件开发工具包。 Claude SDK for Python 0.87.0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创建的文件权限不当，可能导致本地攻击者读取或修改代理状态。
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-python >= 0.86.0, < 0.87.0 -

II. Public POCs for CVE-2026-34450

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III. Intelligence Information for CVE-2026-34450

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Vendor Advisories for CVE-2026-34450 (1)

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

CVE-2026-34451 Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Di
CVE-2026-34452 Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape

IV. Related Vulnerabilities

Same product: anthropic-sdk-python
Same vendor: anthropics
Same weakness: CWE-276

V. Comments for CVE-2026-34450

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