CVE-2026-39890

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-32vr-5gcf-3pw2	Vendor Advisory
https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-32vr-5gcf-3pw2	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-08 21:17

Updated : 2026-07-24 21:10

NVD link : CVE-2026-39890

Mitre link : CVE-2026-39890

CVE.ORG link : CVE-2026-39890

JSON object : View

Products Affected

praison

praisonai

CWE

CWE-502

Deserialization of Untrusted Data

{"id": "CVE-2026-39890", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39890", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-04-09T14:52:17.800295Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "MervinPraison", "product": "PraisonAI", "versions": [{"status": "affected", "version": "< 4.5.115"}]}]}], "published": "2026-04-08T21:17:01.267", "references": [{"url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-32vr-5gcf-3pw2", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-32vr-5gcf-3pw2", "tags": ["Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-502"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "PraisonAI es un sistema de equipos multiagente. Antes de la versi\u00f3n 4.5.115, el m\u00e9todo AgentService.loadAgentFromFile utiliza la biblioteca js-yaml para analizar archivos YAML sin deshabilitar etiquetas peligrosas (como !!js/function y !!js/undefined). Esto permite a un atacante crear un archivo YAML malicioso que, al ser analizado, ejecuta c\u00f3digo JavaScript arbitrario. Un atacante puede explotar esta vulnerabilidad subiendo un archivo de definici\u00f3n de agente malicioso a trav\u00e9s del endpoint de la API, lo que lleva a la ejecuci\u00f3n remota de c\u00f3digo (RCE) en el servidor. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 4.5.115."}], "lastModified": "2026-07-24T21:10:00.143", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B0754891-B47D-441D-A0E6-710A49389AE4", "versionEndIncluding": "4.5.114"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}