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CVE-2026-84288— NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt 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.

在 NousResearch 的 hermes-agent（版本 0.18.2 及更早版本）中发现了一个漏洞。该漏洞位于 ACP Prompt 工作流组件中 文件的 函数。对该函数的操纵可导致服务拒绝（DoS）攻击。该攻击可从远程执行。该漏洞的利用方式已向公众披露，并可能被利用。厂商此前已就此事被联系，但未作出任何回应。

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-84288

Vulnerability Information
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Vulnerability Title
NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in NousResearch hermes-agent up to 0.18.2. This affects the function HermesACPAgent.prompt of the file acp_adapter/session.py of the component ACP Prompt Workflow. Such manipulation leads to denial of service. The attack may be performed from remote. The exploit has been disclosed to the public 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

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-2026-84288

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III. Intelligence Information for CVE-2026-84288

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Other References for CVE-2026-84288 (1)

Other References for CVE-2026-84288 (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-2026-84289 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-2026-84288

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