CVE-2026-14539
Severity CVSS v4.0:
MEDIUM
Type:
Unavailable / Other
Publication date:
31/07/2026
Last modified:
31/07/2026
Description
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.
Impact
Base Score 4.0
6.60
Severity 4.0
MEDIUM