---
cve: "CVE-2026-14539"
severity: "MEDIUM"
cvss: 6.6
epss: "21%"
vendor: "Google"
kev: false
exploited: false
published: "2026-07-31 01:45:35"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T04:02:30+02:00"
---

# CVE-2026-14539

> 6.6 MEDIUM · 🧪 PoC

## Beschreibung

An allocation of resources without limits vulnerability in the HTTP handler component of Google mcp-toolbox versions up to and including 1.4.0 allows an unauthenticated attacker to cause a denial of service (DoS). The /mcp endpoint handler reads incoming payloads directly into system memory using an unrestricted buffer loop (io.ReadAll) without applying defensive constraints such as http.MaxBytesReader or pre-read Content-Length enforcement. By submitting a single, massive HTTP request body, an attacker can linearly consume available host memory until the runtime process is terminated by an Out-Of-Memory (OOM) error.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
```

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

## Patch verfügbar (OSV)

- 45c0f86ce0199a8aed9c980370dd2c03f2684f5a (Commit)

## Referenzen

- <https://github.com/googleapis/mcp-toolbox/pull/3216>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-14539) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_