| Title | zhayujie CowAgent 2.1.3 Denial of Service |
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| Description | CowAgent 2.1.3 has a denial of service vulnerability in the browser tool workflow.
The browser tool accepts prompt-controlled wait/evaluate operations and runs them through a process-wide shared BrowserService backed by a single Playwright worker thread. When a caller or upstream client times out, the underlying Playwright operation is not cancelled.
An attacker who can influence an agent task through prompt injection can cause the agent to invoke a long browser wait or evaluate operation. This can keep the shared browser thread occupied after the client timeout, causing later normal browser operations to queue and fail within normal deadlines.
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| Source | ⚠️ https://github.com/hackerguopeng/cve/tree/main/CowAgent_Browser_Evaluate_Wait_DoS_Report |
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| User | hackerguopeng (UID 99623) |
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| Submission | 07/09/2026 10:50 (2 months ago) |
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| Moderation | 09/01/2026 19:56 (2 months later) |
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| Status | Accepted |
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| VulDB entry | 397792 [zhayujie CowAgent up to 2.1.3 Browser Tool browser_tool.py BrowserTool denial of service] |
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| Points | 20 |
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