{"action":"Upgrade mcp to 1.23.0 or later.","affected":[{"fixed":"1.23.0","introduced":"0"}],"component":"mcp","cve_ids":["CVE-2025-66416"],"ecosystem":"PyPI","epss":0.00544,"exploited":false,"fixed_versions":["1.23.0"],"ghsa_id":"GHSA-9h52-p55h-vw2f","id":"tcs_01M5KFAXGBWXZJRXWM6TX5WB2R","modified_at":"2026-09-10T03:50:31.741008234Z","published_at":"2025-12-02T16:52:08Z","references":["https://osv.dev/vulnerability/GHSA-9h52-p55h-vw2f","https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-9h52-p55h-vw2f","https://nvd.nist.gov/vuln/detail/CVE-2025-66416","https://github.com/modelcontextprotocol/python-sdk/commit/d3a184119e4479ea6a63590bc41f01dc06e3fa99","https://github.com/advisories/GHSA-9h52-p55h-vw2f","https://github.com/modelcontextprotocol/python-sdk","https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1617.yaml","https://pypi.org/project/mcp"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"GHSA-9h52-p55h-vw2f","url":"https://osv.dev/vulnerability/GHSA-9h52-p55h-vw2f"},{"source":"nvd","source_id":"CVE-2025-66416","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66416"}],"summary":"Model Context Protocol (MCP) Python SDK does not enable DNS rebinding protection by default"}