PT-2026-29379 · Anthropic · Anthropic-Sdk-Typescript

Published 2026-03-31 · Updated 2026-03-31 · CVE-2026-34451

NVD

CVSS v4.0

6.3

Medium

AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Path traversal

Weakness Enumeration

CWE-41

CWE-22

Related Identifiers

CVE-2026-34451

Affected Products

Anthropic-Sdk-Typescript

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-34451 · Security Note
• https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9 · Note
• https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c · Note
• https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0 · Note