{"id":"CVE-2026-34451","title":"Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications","summary":"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 …","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","cwe":["CWE-22","CWE-41"],"vendor":"anthropic","product":"claude_sdk_for_typescript","affected":["claude_sdk_for_typescript >= 0.79.0, < 0.81.0"],"patched":["claude_sdk_for_typescript 0.81.0"],"published":"2026-03-31","updated":"2026-07-24","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-34451","references":[{"url":"https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9","label":"security-advisories@github.com"},{"url":"https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0","label":"security-advisories@github.com"},{"url":"https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00349,"epssPercentile":0.28579,"ingestedAt":"2026-07-25T21:03:58.058Z","slug":"CVE-2026-34451","body":"## Overview\n\nClaude 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.\n\n## Affected\n\n- `claude_sdk_for_typescript >= 0.79.0, < 0.81.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `claude_sdk_for_typescript 0.81.0`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}