CVE-2026-84425 zhayujie CowAgent Browser Tool browser_tool.py BrowserTool denial of service
Remote attackers can cause a denial of service in the CowAgent browser tool via a manipulation in the BrowserTool function.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84425?
CVE-2026-84425 is a medium-severity denial of service vulnerability in zhayujie CowAgent, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-404
Which versions are affected by CVE-2026-84425?
How do I fix CVE-2026-84425?
No fix has been published for CVE-2026-84425 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-84425 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84425 exists.
Sources
Also known as GHSA-33c2-g8hf-fxjf.