Mark3Labs Mcp Go vulnerabilities
2 vulnerabilities
Known vulnerabilities in Mark3Labs Mcp Go, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.
PrioritiseCVE-2026-108859mark3labs · mcp-gomcp-go through 1.2.1 Denial of Service via Unbounded POST Body Bufferingmcp-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.CVSS8.7HighEPSS0.55%RoutineCVE-2026-81092mark3labs · mcp-go +1 moremcp-go before 0.56.0 Missing Host Header Validation Enables DNS Rebindingmcp-go accepted requests on its HTTP transports without checking the Host header. StreamableHTTPServer.ServeHTTP in server/streamable_http.go and SSEServer.ServeHTTP in server/sse.go served any request arriving over a loopback connection regardless of the host it named, and the SSE transport's cross-origin default allowed any origin. A page in a browser could therefore point a name it controlled at the loopback address and reach a server listening there, invoking tools and reading resources that the server exposed on the assumption that only local software could connect. No release before 0.56.0 validated the header on either transport; 0.56.0 adds server/http_localhost.go, which rejects a loopback-bound request carrying a host that is not a loopback name, and wires it into both transports.CVSS7.6HighEPSS0.22%