CVE-2026-14539: Denial of Service via Unrestricted Payload Buffering in MCP Toolbox
Google · mcp-toolbox
Affected: Google mcp-toolbox · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 14% of scored CVEs
DescriptionCVE.org
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 products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Google · mcp-toolboxfrom 0.0.0 up to and including 1.4.0
On the Atlas
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CoverageNo articles yet
No CyberSIXT article names CVE-2026-14539 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.