CVE-2026-34450Medium▾ SunlitClaude SDK for Python has Insecure Default File Permissions in Local Filesystem Memory Tool
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27.5 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Jul 13.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.1%
Last analysed / modified upstream
The local filesystem memory tool in the Anthropic Python SDK created memory files with mode 0o666, 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. Both the synchronous and asynchronous memory tool implementations were affected.
Users on the affected versions are advised to update to the latest version.
Claude SDK for Python thanks lucasfutures on HackerOne for the report.
anthropic >= 0.86.0, < 0.87.0Upgrade to a patched release:
anthropic 0.87.0Connected by shared product, vendor, weakness, or advisory.
CVE-2026-34452Medium· 5.3Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape
CVE-2026-34451Medium· 5.4Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications
CVE-2026-22561High· 7.8Uncontrolled search path elements in Anthropic Claude for Windows installer (Claude Setup.exe) versions prior to 1.1.3363 allow local privilege escalation via DLL search-order hijacking