{"id":"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.","aliases":["GHSA-5474-4w2j-mq4c"],"modified":"2026-04-02T13:30:46.273407Z","published":"2026-03-31T21:35:21.018Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34451.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-22","CWE-41"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34451.json"},{"type":"FIX","url":"https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9"},{"type":"WEB","url":"https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0"},{"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/anthropics/anthropic-sdk-typescript","events":[{"introduced":"af66c809a5b59d6dc6e02e405b2c449fd9432e5e"},{"fixed":"bc1a2ff79ca83dfd41445ecde59d2158288a603d"}],"database_specific":{"versions":[{"introduced":"0.79.0"},{"fixed":"0.81.0"}]}}],"versions":["sdk-v0.79.0","sdk-v0.80.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34451.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}