CVE-2026-39890
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductPraisonai
PublishedApr 8, 2026
First seenApr 8, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- praisonai4.5.115 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| praison praisonai | v ≤ 4.5.114 | — |
| praisonaiPyPI | v < 4.5.115 | 4.5.115 |
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