Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-84289— NousResearch hermes-agent MCP Tool mcp_tool.py list_tools memory allocation

Quick assessment

Affected
NousResearch hermes-agent
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 NousResearch 的 hermes-agent（版本 0.18.2 及更早版本）中发现了一个漏洞。该漏洞影响 MCP 工具组件中 文件里的 函数。对数据进行操纵会引发不可控的内存分配问题。该攻击可以远程发起。该漏洞的利用方法已公开，可能已被利用。厂商虽早在披露前已被联系，但至今未作出任何回应。

CVSS 4.3 · Medium
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-84289

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
NousResearch hermes-agent MCP Tool mcp_tool.py list_tools memory allocation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
NousResearch hermes-agent 0.18.0 cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-84289

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-84289

请登录查看更多情报信息。

Other References for CVE-2026-84289 (1)

Other References for CVE-2026-84289 (3)

Same Patch Batch · NousResearch · 2026-09-01 · 3 CVEs total

CVE-2026-84287 4.3 MEDIUM NousResearch hermes-agent Session Chat api_server.py denial of service
CVE-2026-84288 4.3 MEDIUM NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of s

IV. Related Vulnerabilities

Same product: hermes-agent
Same vendor: NousResearch
Same weakness: CWE-789

V. Comments for CVE-2026-84289

No comments yet

Leave a comment