| Package | Affected versions | Patched versions |
|---|---|---|
| claude sdk for typescript | ≥ 0.79.0, < 0.81.0 | 0.81.0 |
| @anthropic-ai/sdk | ≥ 0.79.0, < 0.81.0 | 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.
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!
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