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Advisories

mcp-go through 1.2.1 Denial of Service via Unbounded POST Body Buffering

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severity
high
date
Affecting

  • mcp-go <= 1.2.1

CWE
  • CWE-770 Allocation of Resources Without Limits or Throttling
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
hieuPenguinnn
Description
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.

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