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CVE-2026-34452— Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape

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，该漏洞源于异步本地文件系统内存工具返回未解析的路径，可能导致符号链接攻击，从而脱离沙箱限制。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.14% · P4
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I. Basic Information for CVE-2026-34452

Vulnerability Information
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Vulnerability Title
Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape
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 async local filesystem memory tool in the Anthropic Python SDK validated that model-supplied paths resolved inside the sandboxed memory directory, but then returned the unresolved path for subsequent file operations. A local attacker able to write to the memory directory could retarget a symlink between validation and use, causing reads or writes to escape the sandbox. The synchronous memory tool implementation was not 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:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
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，该漏洞源于异步本地文件系统内存工具返回未解析的路径，可能导致符号链接攻击，从而脱离沙箱限制。
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-2026-34452

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III. Intelligence Information for CVE-2026-34452

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Patches & Fixes for CVE-2026-34452 (1)

Vendor Advisories for CVE-2026-34452 (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-2026-34450 Claude SDK for Python: Insecure Default File Permissions in Local Filesystem Memory Tool

IV. Related Vulnerabilities

Same product: anthropic-sdk-python
Same vendor: anthropics
Same weakness: CWE-59

V. Comments for CVE-2026-34452

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