What’s Vulnerable › Vulnerabilities
CVE-2026-41686: Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool
- Severity: medium (CVSS 4.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-04 · updated 2026-10-26
- Weakness: CWE-732
Description
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 products
- anthropics anthropic-sdk-typescript: from 0.79.0 before 0.91.1 — fixed in 0.91.1
How to fix
Upgrade to a fixed version: anthropics anthropic-sdk-typescript 0.91.1. Check the vendor advisory for mitigations.
References
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