Is CVE-2026-84289 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-84289?

CVE-2026-84289 has a CVSS v3 severity of MEDIUM (4.3).

Back

CVE-2026-84289

Description

A vulnerability was found in NousResearch hermes-agent up to 0.18.2. This vulnerability affects the function list_tools of the file tools/mcp_tool.py of the component MCP Tool. Performing a manipulation results in uncontrolled memory allocation. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.