GitHub Advisoryadvisory · npm

GHSA-p7fg-763f-g4gf Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool

MEDIUM Published 2026-04-29 Modified 2026-05-08 Official page ↗
Aliases
CVE-2026-41686
Ecosystem
npm
Packages
@anthropic-ai/sdk
Severity
Moderate
CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Weaknesses
CWE-732
Reviewed
2026-04-29

Affected packages

• npm @anthropic-ai/sdk: >= 0.79.0, < 0.91.1 → fixed in 0.91.1

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.

Related

Alias · CVE (1)

  • CVE-2026-41686 Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications. vulnerability

Weakness · CWE (1)

  • CWE-732 Incorrect Permission Assignment for Critical Resource weakness

References