{"action":"Upgrade mcp to 0.23.0 or later.","affected":[{"fixed":"0.23.0","introduced":"0"}],"component":"mcp","cve_ids":["CVE-2026-67432"],"ecosystem":"RubyGems","epss":0.00784,"exploited":false,"fixed_versions":["0.23.0"],"ghsa_id":"GHSA-h669-8m4g-r2hc","id":"tcs_01M5KEKH2ZCBV0T3ZTBRSESC9V","modified_at":"2026-07-30T15:00:31.539613886Z","published_at":"2026-07-30T14:44:06Z","references":["https://osv.dev/vulnerability/GHSA-h669-8m4g-r2hc","https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-h669-8m4g-r2hc","https://nvd.nist.gov/vuln/detail/CVE-2026-67432","https://github.com/modelcontextprotocol/ruby-sdk/commit/772e0cb1f9db69312006926eee59a7287ad50166","https://github.com/modelcontextprotocol/ruby-sdk","https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-h669-8m4g-r2hc","url":"https://osv.dev/vulnerability/GHSA-h669-8m4g-r2hc"}],"summary":"MCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport"}