CVE-2026-108769: zhayujie CowAgent denial of service in Markdown rendering

CVE-2026-108769 · Severity: medium · CVSS 4.3 · Published 2026-10-11

CowAgent is a desktop and web-based AI agent that streams responses from language models to users. A flaw in how streamed answers are rendered as Markdown causes the UI to repeatedly reparse the entire accumulated response on each update, allowing a model to craft oversized responses that exhaust CPU and memory resources and freeze or crash the interface.

Technologies: Zhayujie CowAgent. Vendors: Zhayujie.

Quick answers

Is CVE-2026-108769 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-108769 being exploited in the wild.
How severe is CVE-2026-108769?
Medium severity, with a CVSS score of 4.3, published 11 October 2026.
Which products and versions are affected?
Zhayujie CowAgent up to 2.2.0.
Is there a fix for CVE-2026-108769?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-108769 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-108769?
Check whether you run Zhayujie CowAgent at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is an uncontrolled resource consumption flaw (CWE-400) in the Markdown rendering pipeline. Streamed model output is reparsed in full on every delta update without a content size cap on ordinary answers, unlike the capped reasoning output (4 KB). An attacker-controlled or compromised model can emit a large Markdown response, causing 81x amplification in cumulative parsing work and stalling both the web console and desktop UI.

Affected products

  • zhayujie CowAgent up to 2.2.0

Timeline

  • 2026-10-11: disclosed

References

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