CVE-2026-34451: Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories
(updated )
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!
References
- github.com/advisories/GHSA-5474-4w2j-mq4c
- github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9
- github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0
- github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c
- nvd.nist.gov/vuln/detail/CVE-2026-34451
Code Behaviors & Features
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