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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.

PUBLISHED Reserved 2026-04-07 | Published 2026-04-08 | Updated 2026-04-09 | Assigner GitHub_M




CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-502: Deserialization of Untrusted Data

Product status

< 4.5.115
affected

References

github.com/...isonAI/security/advisories/GHSA-32vr-5gcf-3pw2 exploit

github.com/...isonAI/security/advisories/GHSA-32vr-5gcf-3pw2

cve.org (CVE-2026-39890)

nvd.nist.gov (CVE-2026-39890)

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