CVE-2026-34156

CRITICAL 10.0

NocoBase Affected by Sandbox Escape to RCE via console._stdout Prototype Chain Traversal in Workflow Script Node

CVSS Score

10.0

EPSS Score

5.2%

EPSS Percentile

90th

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.

CWE	CWE-913
Vendor	nocobase
Product	nocobase
Published	Mar 31, 2026
Last Updated	Apr 2, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

nocobase / nocobase

< 2.0.28

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/nocobase/nocobase/security/advisories/GHSA-px3p-vgh9-m57c github.com: https://github.com/nocobase/nocobase/pull/8967 github.com: https://github.com/nocobase/nocobase/releases/tag/v2.0.28