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CVE-2026-34450

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

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 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.

CVSS 4.8 · 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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