CVE-2026-34451
CVE-2026-34451 · Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.3 · Medium · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
anthropic-sdk-typescript
- Versions
- >= 0.79.0, < 0.81.0: Affected
No fix published
@anthropic-ai/sdk npm
- Affected ranges
- SEMVER: ≥ 0.79.0, < 0.81.0
Update to 0.81.0
Original sources
- https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c
- https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9
- https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0
- https://nvd.nist.gov/vuln/detail/CVE-2026-34451