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CVE-2026-84425— zhayujie CowAgent Browser Tool browser_tool.py BrowserTool denial of service

Quick assessment

Affected
zhayujie CowAgent
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.

zhayujie CowAgent是zhayujie个人开发者开源的一款机器学习智能代理工具。 zhayujie CowAgent 2.1.3及之前版本存在资源管理错误漏洞，该漏洞源于Browser Tool组件中agent/tools/browser/browser_tool.py文件的BrowserTool函数处理不当，可能导致拒绝服务。

CVSS 4.3 · Medium EPSS 0.47% · P41

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
zhayujie CowAgent 2.1.0 affected
2.1.1 affected
2.1.2 affected
2.1.3 affected
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I. Basic Information for CVE-2026-84425

Vulnerability Information
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Vulnerability Title
zhayujie CowAgent Browser Tool browser_tool.py BrowserTool denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in zhayujie CowAgent up to 2.1.3. This impacts the function BrowserTool of the file agent/tools/browser/browser_tool.py of the component Browser Tool. Performing a manipulation results in denial of service. The attack can be initiated 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
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
zhayujie CowAgent 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zhayujie CowAgent是zhayujie个人开发者开源的一款机器学习智能代理工具。 zhayujie CowAgent 2.1.3及之前版本存在资源管理错误漏洞，该漏洞源于Browser Tool组件中agent/tools/browser/browser_tool.py文件的BrowserTool函数处理不当，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
zhayujie CowAgent 2.1.0 cpe:2.3:a:zhayujie:cowagent:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-84425

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III. Intelligence Information for CVE-2026-84425

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Other References for CVE-2026-84425 (4)

IV. Related Vulnerabilities

Same product: CowAgent
Same vendor: zhayujie
Same weakness: CWE-404