CVE-2026-39890
Critical · 9.8CVSS
9.8
EPSS
0.8%
Published
Apr 8, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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