AI Threat Alert
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...
Full CISO analysis pending enrichment.
Affected Systems
| Package | Ecosystem | Vulnerable Range | Patched |
|---|---|---|---|
| @anthropic-ai/sdk | npm | >= 0.79.0, < 0.91.1 | 0.91.1 |
Do you use @anthropic-ai/sdk? You're affected.
Severity & Risk
Recommended Action
Patch available
Update @anthropic-ai/sdk to version 0.91.1
Compliance Impact
Compliance analysis pending. Sign in for full compliance mapping when available.
Frequently Asked Questions
What is CVE-2026-41686?
Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool
Is CVE-2026-41686 actively exploited?
No confirmed active exploitation of CVE-2026-41686 has been reported, but organizations should still patch proactively.
How to fix CVE-2026-41686?
Update to patched version: @anthropic-ai/sdk 0.91.1.
What is the CVSS score for CVE-2026-41686?
No CVSS score has been assigned yet.
Technical Details
NVD Description
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. Users on the affected versions are advised to update to the latest version. Claude SDK thanks `lucasfutures` for the report.