Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-39890

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 59.2%
CVSS Severity
CVSS v3 Score 9.8
Products affected by CVE-2026-39890


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