CVE-2026-34451

The record

Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications. From version 0.79.0 to before version 0.81.0, 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. This issue has been patched in version 0.81.0.

Affected packages

Related vulnerabilities

• GHSA-5474-4w2j-mq4c Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling… Same vulnerability
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