{"action":"Upgrade github.com/modelcontextprotocol/go-sdk to 1.4.0 or later.","affected":[{"fixed":"1.4.0","introduced":"0"}],"component":"github.com/modelcontextprotocol/go-sdk","cve_ids":["CVE-2026-34742"],"ecosystem":"Go","epss":0.00664,"exploited":false,"fixed_versions":["1.4.0"],"ghsa_id":"GHSA-xw59-hvm2-8pj6","id":"tcs_01M5KGPTE1WDX6VCPP5SC4PMEB","modified_at":"2026-06-25T23:01:17.144844042Z","published_at":"2026-06-25T22:34:41Z","references":["https://osv.dev/vulnerability/GO-2026-5771","https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-xw59-hvm2-8pj6","https://nvd.nist.gov/vuln/detail/CVE-2026-34742","https://github.com/modelcontextprotocol/go-sdk/commit/67bd3f2e2b53ce11a16db8d976cdb8ff1e986b6d","https://github.com/modelcontextprotocol/go-sdk/pull/760","https://github.com/modelcontextprotocol/go-sdk/releases/tag/v1.4.0"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-5771","url":"https://osv.dev/vulnerability/GO-2026-5771"}],"summary":"DNS Rebinding Protection Disabled by Default in Model Context Protocol Go SDK for Servers Running on Localhost in github.com/modelcontextprotocol/go-sdk"}