GHSA-5474-4w2j-mq4cMediumCVSS 5.4

Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories

Published
April 1, 2026
Last Modified
April 24, 2026

🔗 CVE IDs covered (1)

CVE-2026-34451 →

📋 Description

The local filesystem memory tool in the Anthropic TypeScript SDK validated model-supplied paths using a string prefix check that did not append a trailing path separator. A model steered by prompt injection could supply a crafted path that resolved to a sibling directory sharing the memory root's name as a prefix, allowing reads and writes outside the sandboxed memory directory.

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

Claude SDK for TypeScript thanks hackerone.com/nicksim for reporting this issue!

🎯 Affected products1

  • npm/@anthropic-ai/sdk:>= 0.79.0, < 0.81.0

🔗 References (5)