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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.

在 NousResearch 的 hermes-agent 0.18.0 版本中发现了缺陷。该问题影响组件“会话聊天界面”中文件的某些未知功能。对该功能的操纵会导致服务中断（DoS）。此攻击可通过远程方式实施。该漏洞的利用代码已公开，可能被使用。供应商已就此披露事宜早期被联系，但未作任何回应。

CVSS 4.3 · Medium Updated Sep 02, 2026

Possible ATT&CK Techniques 2 AI

T1521 T1499 · Endpoint Denial of Service

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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

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

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-84287

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News Coverage for CVE-2026-84287 (1)

🔗 CVE-2026-84287 NousResearch hermes-agent Session Chat api_server.py denial of service vdb-entry

Other References for CVE-2026-84287 (4)

🔗 cve/Hermes_API_Server_Session_Chat_DoS_Report at main · hackerguopeng/cve · GitHub Read full article exploit
🔗 CVE-2026-84287 in hermes-agent third-party-advisory
🔗 Submit #882712: NousResearch hermes-agent 0.18.0 Denial of Service third-party-advisory
🔗 Submit #882795: NousResearch hermes-agent 0.18.0 Denial of Service Read full article third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-84287

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

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

Quick assessment

Possible ATT&CK Techniques 2 AI

I. Basic Information for CVE-2026-84287

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-84287

III. Intelligence Information for CVE-2026-84287

News Coverage for CVE-2026-84287 (1)

Other References for CVE-2026-84287 (4)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-84287

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