SEPTEMBER 17, 2026
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Case File

CVE-2026-84289

MEDIUM · CVSS 4.3 EPSS 0.27% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-01 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

A vulnerability in the MCP Tool component of NousResearch's hermes-agent, up to version 0.18.2, allows for uncontrolled memory allocation due to improper handling in the list_tools function of tools/mcp_tool.py. This flaw can be exploited remotely, potentially leading to denial of service or other impacts. Organizations using affected versions should prioritize patching or mitigating this vulnerability, especially given the public availability of the exploit.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit
GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-84289
Severity
MEDIUM
CVSS
4.3
EPSS
0.27%

Original NVD 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.