# CVE-2026-34451

## Summary

- **CVE ID:** CVE-2026-34451
- **Severity:** MEDIUM
- **CVSS Score:** 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)
- **CWE:** CWE-22, CWE-41
- **Published:** Mar 31, 2026
- **Last Modified:** Mar 31, 2026

## Description

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.

## Affected Products

- anthropics — anthropic-sdk-typescript (>= 0.79.0, < 0.81.0)

## References

- [CNA](https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c)
- [CNA](https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9)
- [CNA](https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 27.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._