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6.6 Medium

CVE-2026-14539 An allocation of resources without limits vulnerability in the HTTP handler component of Google mcp-toolbox versions…

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.

Affected products and versions

Product Affected versions Fixed in
mcp-toolbox 0.0 0.0.0 → 1.4.0 No fix stated

References

Timeline

  1. Published
  2. Last modified

Other CVEs of mcp-toolbox

The 5 CVEs of mcp-toolbox →
CVE-2026-14541 An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google… 8.0 High CVE-2026-14540 A Server-Side Request Forgery (SSRF) vulnerability exists in the generic HTTP source and tool components of Google… 8.0 High CVE-2026-14538 An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-sql tool component of… 5.7 Medium CVE-2026-14537 Incorrect Authorization in the direct HTTP API tool invocation endpoint in Google mcp-toolbox versions v1.3.0 and v1.4.0… 8.1 High
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