Claude SDK for Python has Insecure Default File Permissions in Local Filesystem Memory Tool

中 4.4CVE-2026-34450 · GHSA-q5f5-3gjm-7mfm · PYSEC-2026-2114 · 31/03/2026 公開 · 24/07/2026 更新

要点

CVE-2026-34450 は anthropic, claude sdk for python (anthropic) に影響する深刻度「中」 (CVSS 4.4) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.13%（全脆弱性の 2.3% より高い）。
対処：0.87.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
anthropic PyPI	`≥ 0.86.0, < 0.87.0`	`0.87.0`
claude sdk for python anthropic	`≥ 0.86.0, < 0.87.0`	`0.87.0`

概要

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.

Users on the affected versions are advised to update to the latest version.

Claude SDK for Python thanks lucasfutures on HackerOne for the report.

NVD の説明

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.