CVE-2026-41686CWE-732

Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool

Medium · published May 4, 2026

CVSS v4.0
4.8
EPSS
0%
Percentile
2.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
4.8 · MEDIUM
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
EPSS
0.00126 · 2.1th percentile
Weakness
CWE-732 · Incorrect Permission Assignment for Critical Resource
Published
2026-05-04T18:41Z
EPSS history
Timeline
  • 04 MAY 18:41Z
    Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool
    cvelistv5