Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories
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](https://hackerone.com/nicksim) for reporting this issue!
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-34451US | medium5.4 | — | ||
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 filesyst… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/anthropics/anthropic-sdk-typescriptPACKAGE
- https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9WEB
- https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0WEB
- https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4cWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-34451ADVISORY
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