rmcp Known Vulnerabilities & Fixes
rmcp has 4 known security vulnerabilities in crates.io (Rust). Upgrade to version 2.1.0 or later to resolve all known issues. Data sourced from OSV, enriched with EPSS exploit probability and CISA KEV.
Low Immediate Risk
No actively exploited vulnerabilities detected. Monitor and update in your next maintenance window.
Recommended safe version: 2.1.0
Upgrading to 2.1.0 or later resolves all 4 known vulnerabilities in rmcp. Update Cargo.toml: rmcp = "2.1.0"
Is rmcp in your project?
Check if you're affected and upgrade to 2.1.0 to stay secure.
Security Summary
- 5 affected version ranges have been identified across these 4 advisories.
- 100% of known issues have a published fixed version.
- Remediation: cargo update -p rmcp
Vulnerabilities
4 unique vulnerabilities — sorted by exploitation risk (KEV → EPSS → CVSS). Click a CVE/GHSA ID for full details. First disclosed May 6, 2026, most recently Sep 17, 2026 (134 days apart).
| CVE / GHSA | Severity | Affected | Fixed In |
|---|---|---|---|
| CVE-2026-42559 rmcp Streamable HTTP server transport has a DNS rebinding vulnerability | HIGH | All versions | 1.4.0, 1.4.0 |
| CVE-2026-63127 RMCP: Missing Resource Field Validation in OAuth Protected Resource Metadata Discovery | HIGH | All versions | 2.0.0 |
| CVE-2026-63128 RMCP: Unauthenticated permanent session-table leak in rmcp Streamable HTTP server transport leads to remote denial-of-service | HIGH | All versions | 2.0.0 |
| CVE-2026-64684 RMCP: Custom HTTP headers leak to cross-origin redirect targets | MEDIUM | All versions | 2.1.0 |
About This Data
Vulnerability data for rmcp is sourced from the Open Source Vulnerability (OSV) database, aggregating reports from GitHub Advisory Database, NIST NVD, and ecosystem-specific sources.
CVSS (Common Vulnerability Scoring System) scores reflect exploitability and impact. EPSS (Exploit Prediction Scoring System) scores indicate the probability of exploitation within the next 30 days. Vulnerabilities marked with are listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
Related crates.io (Rust) Packages
Other packages in this ecosystem, ranked by shared vulnerabilities where available.
Check Your Dependencies
Scan your project to check if you're using a vulnerable version of rmcp.