crates.io/rmcp CVE-2026-42559: high 8.8, EPSS 0.27%
DNS rebinding vulnerability in rmcp Streamable HTTP server transport
Action: Upgrade rmcp to 1.4.0 or later.
cargo update -p rmcp --precise 1.4.0Affected
| introduced | fixed | last affected |
|---|---|---|
| 0.0.0-0 | 1.4.0 | - |
Fixed versions
| 1.4.0 |
Sources
- osv: RUSTSEC-2026-0189
- https://crates.io/crates/rmcp
- https://rustsec.org/advisories/RUSTSEC-2026-0189.html
- https://github.com/modelcontextprotocol/rust-sdk/issues/815
- https://github.com/modelcontextprotocol/rust-sdk/pull/764
- https://github.com/modelcontextprotocol/rust-sdk/issues/822
- https://modelcontextprotocol.io/specification/2025-06-18/basic/transports#security-warning
CVE-2026-42559 · published · modified · JSON