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CVE-2026-34452

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.8 · Medium · EPSS 0.1% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • anthropic-sdk-python

    Versions
    • >= 0.86.0, < 0.87.0: Affected

    No fix published

  • anthropic PyPI

    Versions
    • 0.86.0
    Affected ranges
    • ECOSYSTEM: ≥ 0.86.0, < 0.87.0

    Update to 0.87.0

Original sources

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