What’s Vulnerable › Vulnerabilities

CVE-2026-39890: PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition Loading

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-08 · updated 2026-07-24
• Weakness: CWE-502

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.

Affected products

• MervinPraison PraisonAI: through 4.5.114

References

• https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-32vr-5gcf-3pw2
• https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-32vr-5gcf-3pw2

Get alerted when CVE-2026-39890 or the next vulnerability affects your stack