anthropics/anthropic-sdk-typescript · Security
Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories
- GHSA ID
- GHSA-5474-4w2j-mq4c
- CVE ID
- CVE-2026-34451
- Severity
- medium
- Published
- Updated
- CVSS
- 5.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- CVSS v3
- 5.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- CVSS v4
- 6.3 · 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
Description
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.
Users on the affected versions are advised to update to the latest version.
Claude SDK for TypeScript thanks hackerone.com/nicksim for reporting this issue!
CWEs
- CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CWE-41 · Improper Resolution of Path Equivalence
References
- https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-34451 ↗
- https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9 ↗
- https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0 ↗
- https://github.com/advisories/GHSA-5474-4w2j-mq4c ↗