What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 35.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-31 · updated 2026-07-24
• Weakness: CWE-913

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.

Affected products

• nocobase: before 2.0.28 — fixed in 2.0.28

How to fix

Upgrade to a fixed version: nocobase 2.0.28. Check the vendor advisory for mitigations.

References

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

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