{"action":"Upgrade rmcp to 1.4.0 or later.","affected":[{"fixed":"1.4.0","introduced":"0"}],"component":"rmcp","cve_ids":["CVE-2026-42559"],"ecosystem":"crates.io","epss":0.00269,"exploited":false,"fixed_versions":["1.4.0"],"ghsa_id":"GHSA-89vp-x53w-74fx","id":"tcs_01M5KEVQT9P0CWJTRRX7F4821Z","modified_at":"2026-09-10T03:51:04.771476338Z","published_at":"2026-05-06T21:55:56Z","references":["https://osv.dev/vulnerability/GHSA-89vp-x53w-74fx","https://github.com/modelcontextprotocol/rust-sdk/security/advisories/GHSA-89vp-x53w-74fx","https://github.com/nubo-db/dynoxide/security/advisories/GHSA-fvh2-gm75-j4j7","https://nvd.nist.gov/vuln/detail/CVE-2026-42559","https://github.com/modelcontextprotocol/rust-sdk/issues/815","https://github.com/modelcontextprotocol/rust-sdk/issues/822","https://github.com/modelcontextprotocol/rust-sdk/pull/764","https://github.com/modelcontextprotocol/rust-sdk/commit/8e22aa2de28df5a285eed87c11cd89bf15fa90d3","https://github.com/modelcontextprotocol/rust-sdk","https://modelcontextprotocol.io/specification/2025-06-18/basic/transports#security-warning","https://rustsec.org/advisories/RUSTSEC-2026-0140.html"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"GHSA-89vp-x53w-74fx","url":"https://osv.dev/vulnerability/GHSA-89vp-x53w-74fx"}],"summary":"rmcp Streamable HTTP server transport has a DNS rebinding vulnerability"}