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

CVSS 9.8 · Critical EPSS 0.56% · P68
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I. Basic Information for CVE-2026-39890

Vulnerability Information
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Vulnerability Title
PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition Loading
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
可信数据的反序列化
Source: NVD (National Vulnerability Database)
Vulnerability Title
PraisonAI 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PraisonAI是Mervin Praison个人开发者的一个低代码多智能体协作框架。 PraisonAI 4.5.115之前版本存在代码问题漏洞，该漏洞源于YAML解析未禁用危险标签，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

VendorProductAffected VersionsCPESubscribe
MervinPraisonPraisonAI < 4.5.115 -

II. Public POCs for CVE-2026-39890

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III. Intelligence Information for CVE-2026-39890

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Same Patch Batch · MervinPraison · 2026-04-08 · 4 CVEs total

CVE-2026-3988810.0 CRITICALPraisonAIAgents has a sandbox escape via exception frame traversal in `execute_code` (subp
CVE-2026-398918.8 HIGHPraisonAI has a Template Injection in Agent Tool Definitions
CVE-2026-398897.5 HIGHPraisonAI has Unauthenticated SSE Event Stream Exposes All Agent Activity in A2U Server

IV. Related Vulnerabilities

Same product: PraisonAI
Same vendor: MervinPraison
Same weakness: CWE-502

V. Comments for CVE-2026-39890

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