GitHub Advisoryadvisory · npm

GHSA-5474-4w2j-mq4c Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories

MEDIUM Published 2026-04-01 Modified 2026-04-24 Official page ↗
Aliases
CVE-2026-34451
Ecosystem
npm
Packages
@anthropic-ai/sdk
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Weaknesses
CWE-22, CWE-41
Reviewed
2026-04-01

Affected packages

• npm @anthropic-ai/sdk: >= 0.79.0, < 0.81.0 → fixed in 0.81.0

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!

Related

Alias · CVE (1)

  • CVE-2026-34451 Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications. vulnerability

Weakness · CWE (2)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness
  • CWE-41 Improper Resolution of Path Equivalence weakness

References