Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications.
Date: 2026-05
Affected: anthropic/claude_sdk_for_typescript
Attack vector: path-traversal
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-34451
CVE-2026-41686
CWE: CWE-22
CWE-41
CWE-732
CVSS: 4.4 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)

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 0.91.1, the BetaLocalFilesystemMemoryTool in the Anthropic TypeScript SDK created memory files and directories using the Node.js default modes (0o666 for files, 0o777 for directories), leaving them world-readable on systems with a standard umask and world-writable in environments with a permissive umask such as many Docker base images. A local attacker on a shared host could read persisted agent state, and in containerized deployments could modify memory files to influence subsequent model behavior. This issue has been patched in version 0.91.1.


Mitigations:

Architectural layers (MAESTRO):