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

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-02 · updated 2026-09-02
Weakness: CWE-404

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.

Affected products

zhayujie CowAgent: 2.1.0, 2.1.1, 2.1.2, 2.1.3

References

https://github.com/hackerguopeng/cve/tree/main/CowAgent_Browser_Evaluate_Wait_DoS_Report
https://vuldb.com/cve/CVE-2026-84425
https://vuldb.com/submit/884017
https://vuldb.com/vuln/397792
https://vuldb.com/vuln/397792/cti

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