CVE-2026-23912high · CVSS 8.1patched
MCP protocol — tool description spoofing across implementations
A flaw in the way several MCP server implementations handled tool description updates allowed a malicious MCP server to silently rename a tool after handshake. Agents that cached the original tool name could be tricked into invoking a different tool. Affected the MCP server libraries used by both OpenClaw and Hermes Agent.
Affects: OpenClaw, Hermes AgentPublished: 2026-04-03Versions: MultipleFixed in: OpenClaw 2026.4.5, Hermes 2026.4.3, mcp-server-go 0.7.4