CVE-2026-84427 zhayujie CowAgent Bash Tool bash.py denial of service
Remote attackers can cause a denial of service in CowAgent via the Bash Tool component, requiring permissions to exploit.
- 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-2026-84427?
CVE-2026-84427 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 determined in zhayujie CowAgent up to 2.1.7. Affected is an unknown function of the file agent/tools/bash/bash.py of the component Bash Tool. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
Weakness: CWE-404
Which versions are affected by CVE-2026-84427?
How do I fix CVE-2026-84427?
No fix has been published for CVE-2026-84427 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-2026-84427 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84427 exists.
Sources
Also known as GHSA-wh78-4m24-7957.