{"action":"Upgrade rmcp to 2.1.0 or later.","affected":[{"fixed":"2.1.0","introduced":"0"}],"component":"rmcp","cve_ids":["CVE-2026-64684"],"ecosystem":"crates.io","epss":0.005,"exploited":false,"fixed_versions":["2.1.0"],"ghsa_id":"GHSA-9g45-5xwm-f3wc","id":"tcs_01M5KEWD1GZ1XARPR10YP3YREK","modified_at":"2026-09-17T16:45:06.215938994Z","published_at":"2026-09-17T14:48:12Z","references":["https://osv.dev/vulnerability/GHSA-9g45-5xwm-f3wc","https://github.com/modelcontextprotocol/rust-sdk/security/advisories/GHSA-9g45-5xwm-f3wc","https://nvd.nist.gov/vuln/detail/CVE-2026-64684","https://github.com/modelcontextprotocol/rust-sdk/pull/936","https://github.com/modelcontextprotocol/rust-sdk/commit/496902b9cf2c8a947454718da31829ae776b969b","https://github.com/modelcontextprotocol/rust-sdk","https://github.com/modelcontextprotocol/rust-sdk/releases/tag/rmcp-v2.1.0"],"severity":{"label":"medium","score":6.8},"sources":[{"source":"osv","source_id":"GHSA-9g45-5xwm-f3wc","url":"https://osv.dev/vulnerability/GHSA-9g45-5xwm-f3wc"}],"summary":"RMCP: Custom HTTP headers leak to cross-origin redirect targets"}