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CVE-2026-34156— NocoBase Affected by Sandbox Escape to RCE via console._stdout Prototype Chain Traversal in Workflow Script Node

Quick assessment

Affected
nocobase nocobase
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nocobase是NocoBase开源的一个低代码平台。 NocoBase 2.0.28之前版本存在安全漏洞，该漏洞源于工作流脚本节点在Node.js vm沙箱中执行用户提供的JavaScript时，传递给沙箱环境的console对象暴露了主机领域的WritableWorkerStdio流对象，可能导致经过身份验证的攻击者遍历原型链以逃逸沙箱并实现远程代码执行。

CVSS 10.0 · Critical EPSS 6.79% · P94

Public Exploits 2

ExploitDB · 1 EDB-52552 [local]
Nuclei · 1 CVE-2026-34156.yaml [template]
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I. Basic Information for CVE-2026-34156

Vulnerability Information
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Vulnerability Title
NocoBase Affected by Sandbox Escape to RCE via console._stdout Prototype Chain Traversal in Workflow Script Node
Source: CVE Program / CVE List V5
Vulnerability Description
NocoBase is an AI-powered no-code/low-code platform for building business applications and enterprise solutions. Prior to version 2.0.28, NocoBase's Workflow Script Node executes user-supplied JavaScript inside a Node.js vm sandbox with a custom require allowlist (controlled by WORKFLOW_SCRIPT_MODULES env var). However, the console object passed into the sandbox context exposes host-realm WritableWorkerStdio stream objects via console._stdout and console._stderr. An authenticated attacker can traverse the prototype chain to escape the sandbox and achieve Remote Code Execution as root. This issue has been patched in version 2.0.28.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
动态管理代码资源的控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nocobase 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nocobase是NocoBase开源的一个低代码平台。 NocoBase 2.0.28之前版本存在安全漏洞，该漏洞源于工作流脚本节点在Node.js vm沙箱中执行用户提供的JavaScript时，传递给沙箱环境的console对象暴露了主机领域的WritableWorkerStdio流对象，可能导致经过身份验证的攻击者遍历原型链以逃逸沙箱并实现远程代码执行。
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

Vendor Product Affected Versions CPE Subscribe
nocobase nocobase < 2.0.28 -

II. Public POCs for CVE-2026-34156

# POC Description Source Link Shenlong Link
1 NocoBase Workflow Script Node executes user-supplied JavaScript inside a Node.js vm sandbox with a custom require allowlist controlled by WORKFLOW_SCRIPT_MODULES env var. The console object passed into the sandbox context exposes host-realm WritableWorkerStdio stream objects via console._stdout and console._stderr. An authenticated attacker can traverse the prototype chain (console._stdout.constructor.constructor to Function to process to child_process) to escape the sandbox and achieve Remote Code Execution as root. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34156.yaml POC Details
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III. Intelligence Information for CVE-2026-34156

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Vendor Advisories for CVE-2026-34156 (1)

IV. Related Vulnerabilities

Same product: nocobase
Same vendor: nocobase
Same weakness: CWE-913

V. Comments for CVE-2026-34156

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