CVE-2026-34451

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.

Score

CVSS 4.0 6.3 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-03-31

Last modified

2026-04-01

Weaknesses

CWE-22, CWE-41

Affected products

• Claude Sdk For Typescript (Anthropic)
• Anthropic-sdk-typescript (Anthropics)

References

• https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9
• https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0
• https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c