Submeter #958015: zhayujie CowAgent 2.1.6 Denial of Service

CowAgent has a medium-high impact denial of service vulnerability in multiple channel media download handlers.

Feishu, DingTalk, QQ, Slack, and WeCom media paths download attacker-controlled image, file, audio, or video content without a unified byte limit. Several paths read response.content directly, buffering the full HTTP response in memory before writing it to disk. Slack streams chunks but does not enforce a cumulative byte cap. Some Feishu downloads also omit request timeouts.

An attacker who can send media to a configured bot can force CowAgent to consume excessive memory, disk space, channel worker time, and downstream vision/STT/model budget, degrading responsiveness or making the service unavailable.

Verified on commit 61206ba73479db054921594a57b7df1c82694d29 / desktop version 2.1.6 with a safe local PoC.

• Fonte: ⚠️ https://github.com/lche511/cve/tree/main/CowAgent_Channel_Media_Download_DoS_Report
• Utilizador: pengguogood (UID 72903)
• Submissão: 03/09/2026 11h41 (há 2 meses)
• Moderação: 10/10/2026 23h22 (1 month later)
• Estado: Aceite
• Entrada VulDB: 416391 [zhayujie CowAgent até 2.1.9 Media Download Negação de Serviço]
• Pontos: 20