cvedb.io
CVE-2026-39890
CRITICAL · CVSS 9.8
EPSS exploitation probability: 0%
Published 2026-04-08T21:17:01.267 · Last modified 2026-06-17T10:42:45.630

Summary

PraisonAI is a multi-agent teams system. Prior to 4.5.115, the AgentService.loadAgentFromFile method uses the js-yaml library to parse YAML files without disabling dangerous tags (such as !!js/function and !!js/undefined). This allows an attacker to craft a malicious YAML file that, when parsed, executes arbitrary JavaScript code. An attacker can exploit this vulnerability by uploading a malicious agent definition file via the API endpoint, leading to remote code execution (RCE) on the server. This vulnerability is fixed in 4.5.115.

Affected products

praison — praisonai

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.