CVE-2026-34451Medium· 5.4▾ SunlitClaude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications. From version 0.79.0 to before version 0.81.0, the local filesystem memory tool in the Anthropic TypeScript SDK validated …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.7 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 25.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.3%
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 0.81.0, the local filesystem memory tool in the Anthropic TypeScript SDK validated model-supplied paths using a string prefix check that did not append a trailing path separator. A model steered by prompt injection could supply a crafted path that resolved to a sibling directory sharing the memory root's name as a prefix, allowing reads and writes outside the sandboxed memory directory. This issue has been patched in version 0.81.0.
claude_sdk_for_typescript >= 0.79.0, < 0.81.0Upgrade past the affected range:
claude_sdk_for_typescript 0.81.0Connected by shared product, vendor, weakness, or advisory.
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