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CVE-2026-39890

CRITICAL Exploitation: PoC
9.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-39890
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-04-07 20:32 UTC
Published
2026-04-08 20:45 UTC
Last updated
2026-04-09 16:16 UTC
Primary CWE
CWE-502
CWE-502: Deserialization of Untrusted Data
Vendor / Product
MervinPraison / PraisonAI
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
yes
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
MervinPraison PraisonAI — < 4.5.115
Weakness (CWE)
CWESourceDescription
CWE-502 cna CWE-502: Deserialization of Untrusted Data
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References (1)
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