---
cve: "CVE-2026-34451"
severity: "MEDIUM"
cvss: 6.3
epss: "35%"
vendor: "anthropics"
kev: false
exploited: false
published: "2026-03-31 22:16:20"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T01:02:19+02:00"
---

# CVE-2026-34451

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- bc1a2ff79ca83dfd41445ecde59d2158288a603d (Commit)
- 0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9 (Commit)

## Referenzen

- <https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c>
- <https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9>
- <https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34451) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_