Vulnerability Details CVE-2026-34451
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 17.9%
CVSS Severity
CVSS v3 Score 5.4
References
Products affected by CVE-2026-34451
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cpe:2.3:a:anthropic:claude_sdk_for_typescript:0.79.0
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cpe:2.3:a:anthropic:claude_sdk_for_typescript:0.80.0