github.com/modelcontextprotocol/go-sdk (Go) — known CVEs & security advisories

Known CVE vulnerabilities and GitHub Security Advisories affecting the Go package github.com/modelcontextprotocol/go-sdk, with affected version ranges, CVSS severity, EPSS exploit prediction, and CISA KEV status.

CVEs (3)

• CVE-2026-34742 — CVSS 8.1 (high): The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.0, the Model Context Protocol (MCP) Go SDK does not enable DNS…
• CVE-2026-27896 — CVSS 7.5 (high): The Go MCP SDK used Go's standard encoding/json.Unmarshal for JSON-RPC and MCP protocol message parsing in versions prior to 1.3.1. Go's…
• CVE-2026-33252 — CVSS 7.1 (high): The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP transport accepted browser-generated…