{"id":"CVE-2026-34451","aliases":["GHSA-5474-4w2j-mq4c"],"url":"https://o3.security/vulnerability/CVE-2026-34451","summary":"Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories","details":"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.","published":"2026-03-31T21:35:21.018Z","modified":"2026-07-27T03:56:24.691969382Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@anthropic-ai/sdk","fixedVersion":"0.81.0"}],"fix":{"url":"https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9","label":"anthropics/anthropic-sdk-typescript@0ac69b3"},"references":[{"type":"WEB","url":"https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34451.json"},{"type":"ADVISORY","url":"https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34451"},{"type":"FIX","url":"https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-27T03:56:24.691969382Z"}}