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CVE-2026-84287— NousResearch hermes-agent Session Chat api_server.py denial of service

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.

Nous Research Hermes Agent是Nous Research团队的一个基于机器学习的人工智能代理。 Nous Research Hermes Agent 0.18.0版本存在资源管理错误漏洞，该漏洞源于Session Chat Interface组件中gateway/platforms/api_server.py文件的某些未知功能，可能导致拒绝服务。

CVSS 4.3 · Medium EPSS 0.52% · P43

Possible ATT&CK Techniques 2 AI

T1521 T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
NousResearch hermes-agent 0.18.0 affected
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I. Basic Information for CVE-2026-84287

Vulnerability Information
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Vulnerability Title
NousResearch hermes-agent Session Chat api_server.py denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in NousResearch hermes-agent 0.18.0. Affected by this issue is some unknown functionality of the file gateway/platforms/api_server.py of the component Session Chat Interface. This manipulation causes denial of service. The attack is possible to be carried out remotely. The exploit has been published and may 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
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
Nous Research Hermes Agent 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nous Research Hermes Agent是Nous Research团队的一个基于机器学习的人工智能代理。 Nous Research Hermes Agent 0.18.0版本存在资源管理错误漏洞，该漏洞源于Session Chat Interface组件中gateway/platforms/api_server.py文件的某些未知功能，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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-2026-84287

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III. Intelligence Information for CVE-2026-84287

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News Coverage for CVE-2026-84287 (2)

Other References for CVE-2026-84287 (3)

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

CVE-2026-84288 4.3 MEDIUM NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of s
CVE-2026-84289 4.3 MEDIUM NousResearch hermes-agent MCP Tool mcp_tool.py list_tools memory allocation

IV. Related Vulnerabilities

Same product: hermes-agent
Same vendor: NousResearch
Same weakness: CWE-404

V. Comments for CVE-2026-84287

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