CVE-2026-41686 — Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
anthropics / anthropic-sdk-typescript	affected >= 0.79.0, < 0.91.1

CWE

CWE-732

References

https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-p7fg-763f-g4gf

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.