CVE-2026-84427
Received Received - Intake

Denial of Service in zhayujie CowAgent Bash Tool

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: VulDB

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.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-02
AI Q&A
2026-09-02
EPSS Evaluated
N/A
NVD
CVE-2026-84427
EUVD
EUVD-2026-69782

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
zhayujie cowagent to 2.1.7 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-404 The product does not release or incorrectly releases a resource before it is made available for re-use.

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Executive Summary

This vulnerability is a denial of service issue in CowAgent versions up to 2.1.7. It exists in the Bash tool component where the agent stores all command output in memory before truncating it. An attacker can exploit this by forcing the agent to run a command that generates large output, causing excessive memory and disk usage, leading to system resource exhaustion and process unavailability.

Detection Guidance

To detect this vulnerability, monitor for unusually high memory or disk usage from the CowAgent process. Check logs for repeated calls to the Bash tool with large output. Use system monitoring tools like top, htop, or ps to observe resource consumption by the agent process.

Impact Analysis

If exploited, this vulnerability can make the CowAgent process unavailable due to high memory and disk usage. It may cause system slowdowns, crashes, or service disruptions for applications relying on the agent. Remote attackers could trigger this without authentication if the Bash tool is enabled.

Compliance Impact

This vulnerability primarily causes denial of service by exhausting system resources through memory and disk usage. It does not directly affect data confidentiality or integrity, which are key concerns for GDPR and HIPAA. However, prolonged unavailability of the agent process could impact system operations, potentially leading to service disruptions that may violate availability requirements in these regulations.

Mitigation Strategies

Disable the Bash tool by default in CowAgent configuration. Implement server-side timeouts for tool execution. Use byte-capped buffers to limit output size. Sandbox Bash execution to prevent resource exhaustion. Add regression tests to reject oversized output before buffering.

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