CVE-2026-108859 — mcp-go through 1.2.1 Denial of Service via Unbounded POST Body Buffering
mcp-go through 1.2.1 contains a denial of service vulnerability in StreamableHTTPServer.ServeHTTP that allows remote unauthenticated attackers to exhaust memory by sending overs…
Published: 2026-10-11 · CVSS: 8.7 · CVSS 4.0
mcp-go through 1.2.1 contains a denial of service vulnerability in StreamableHTTPServer.ServeHTTP that allows remote unauthenticated attackers to exhaust memory by sending oversized POST bodies. Attackers can send arbitrarily large or many concurrent POST requests, read fully via io.ReadAll before validation, to degrade or OOM-kill the server process.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7