---
id: CVE-2026-14539
title: >-
  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)
summary: >-
  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
  handl…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: google
product: mcp_toolbox_for_databases
affected:
  - mcp_toolbox_for_databases < 1.5.0
patched:
  - mcp_toolbox_for_databases 1.5.0
published: '2026-07-31'
updated: '2026-08-08'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-14539'
references:
  - url: 'https://github.com/googleapis/mcp-toolbox/pull/3216'
    label: cve-coordination@google.com
tags:
  - nvd
epss: 0.00238
epssPercentile: 0.1321
ingestedAt: '2026-08-08T14:22:57.175Z'
---

## Overview

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.

## Affected

- `mcp_toolbox_for_databases < 1.5.0`

## Remediation

Upgrade past the affected range:

- `mcp_toolbox_for_databases 1.5.0`