CVE-2026-34451
Description
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.
How to fix
- anthropic claude_sdk_for_typescript0.81.0 or later
- @anthropic-ai/sdk0.81.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| anthropic claude_sdk_for_typescript | 0.79.0 ≤ v < 0.81.0 | 0.81.0 |
| @anthropic-ai/sdknpm | 0.79.0 ≤ v < 0.81.0 | 0.81.0 |
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