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.
Metrics
Affected Vendors & Products
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References
| Link | Providers |
|---|---|
| https://github.com/googleapis/mcp-toolbox/pull/3216 |
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History
Fri, 31 Jul 2026 02:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Denial of Service via Unrestricted Payload Buffering in MCP Toolbox | |
| Weaknesses | CWE-770 | |
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| Metrics |
cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: Google
Published:
Updated: 2026-07-31T01:45:35.468Z
Reserved: 2026-07-03T02:17:44.796Z
Link: CVE-2026-14539
Vulnrichment
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