{"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":0.00512,"exploited":false,"fixed_versions":["1.23.0"],"ghsa_id":"GHSA-9h52-p55h-vw2f","id":"tcs_01M5KGTNJW4A6FN9X8PRHS7QE6","modified_at":"2026-07-07T17:47:04.409703799Z","published_at":"2026-07-07T16:03:11.859199Z","references":["https://osv.dev/vulnerability/PYSEC-2026-1617","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/modelcontextprotocol/python-sdk","https://pypi.org/project/mcp","https://github.com/advisories/GHSA-9h52-p55h-vw2f"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"PYSEC-2026-1617","url":"https://osv.dev/vulnerability/PYSEC-2026-1617"},{"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"}