{"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":0.00455,"exploited":false,"fixed_versions":["1.4.0"],"ghsa_id":"GHSA-xw59-hvm2-8pj6","id":"tcs_01M5KFSVNJ4JAR55G78KDTSQ0P","modified_at":"2026-07-21T15:15:52.149296919Z","published_at":"2026-04-01T21:09:09Z","references":["https://osv.dev/vulnerability/GHSA-xw59-hvm2-8pj6","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/pull/760","https://github.com/modelcontextprotocol/go-sdk/commit/67bd3f2e2b53ce11a16db8d976cdb8ff1e986b6d","https://access.redhat.com/errata/RHSA-2026:21772","https://access.redhat.com/security/cve/CVE-2026-34742","https://bugzilla.redhat.com/show_bug.cgi?id=2454608","https://github.com/modelcontextprotocol/go-sdk","https://github.com/modelcontextprotocol/go-sdk/releases/tag/v1.4.0","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34742.json"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"GHSA-xw59-hvm2-8pj6","url":"https://osv.dev/vulnerability/GHSA-xw59-hvm2-8pj6"}],"summary":"DNS Rebinding Protection Disabled by Default in Model Context Protocol Go SDK for Servers Running on Localhost"}