Allocation of Resources in CowAgent via Streaming Tool-Call Argument Handler

Executive Summary

CVE-2026-108768 is a denial-of-service (DoS) vulnerability in zhayujie CowAgent up to version 2.2.0. It occurs in the Streaming Tool-Call Argument Handler where the function json.loads processes argument fragments without size limits. Attackers can remotely send large tool arguments, causing CowAgent to consume excessive memory and CPU during parsing or JSON repair, leading to resource exhaustion.

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Detection Guidance

Monitor for unusual memory or CPU usage spikes during JSON parsing operations in CowAgent. Check for processes consuming excessive resources when handling tool-call arguments. Use system monitoring tools like top, htop, or ps to identify abnormal resource consumption by CowAgent processes.

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Impact Analysis

This vulnerability can degrade system performance, cause delayed responses, and potentially make CowAgent unavailable for other users sharing the same process. It may also lead to crashes or service disruptions if resource limits are exceeded during processing of malicious tool arguments.

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Compliance Impact

This vulnerability could indirectly impact compliance with GDPR and HIPAA by enabling denial-of-service (DoS) attacks that disrupt service availability. GDPR requires maintaining system availability, while HIPAA mandates reliable access to protected health information. Resource exhaustion from this flaw may lead to service degradation or unavailability, potentially violating these requirements.

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Mitigation Strategies

Implement a hard limit on tool-call argument size during streaming in CowAgent. Update to the latest version if available. If no patch exists, modify the source code to enforce size limits before json.loads() or json_repair operations. Monitor for DoS attempts and block suspicious large payloads.

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