CVE-2026-34156

CRITICAL NUCLEI

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

Title source: cna

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.

Exploits (2)

nomisec WORKING POC
by franckboumendil · poc
https://github.com/franckboumendil/CVE-2026-34156
nomisec WORKING POC
by 0xBlackash · poc
https://github.com/0xBlackash/CVE-2026-34156

Nuclei Templates (1)

NocoBase - VM Sandbox Escape to Remote Code Execution
CRITICALVERIFIEDby theamanrawat
Shodan: http.title:"NocoBase"
FOFA: body="__nocobase_public_path__"

References (3)

Scores

CVSS v3 9.9
EPSS 0.0893
EPSS Percentile 92.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Details

CWE
CWE-913
Status published
Products (2)
nocobase/nocobase < 2.0.28 (2 CPE variants)
nocobase/plugin-workflow-javascript 0 - 2.0.28npm
Published Mar 31, 2026
Tracked Since Mar 31, 2026