CVE-2026-41686
MediumCVSS 4.4Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Claude SDK for TypeScript from version 0.79.0 to before 0.91.1, the BetaLocalFilesystemMemoryTool created memory files and directories using Node.js default modes (0o666 for files, 0o777 for directories), leaving them world-readable under a standard umask and world-writable in environments with a permissive umask such as many Docker base images.
Risk Assessment
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 may lead to data leakage or manipulation of agent behavior.
Recommendation
Update the Claude SDK for TypeScript to version 0.91.1 or later. Additionally, consider setting a restrictive umask in runtime environments.
Other vulnerabilities in Claude SDK for TypeScript
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS