CVE-2026-39890
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk44th percentile - higher than 44% of all known CVEs
Summary
PraisonAI prior to 4.5.115 has a vulnerability in the AgentService.loadAgentFromFile method that 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.
Risk Assessment
An attacker can upload a malicious agent definition file via the API endpoint, leading to remote code execution (RCE) on the server.
Recommendation
Update PraisonAI to version 4.5.115 or later, which fixes this vulnerability.
Original NVD description (English source)
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.