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Fencer Vulns
critical 10.0

CVE-2026-34156 in the critical feed json

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

published 2026-03-30 7 mo ago modified 2026-07-24 3 mo ago also GHSA-px3p-vgh9-m57c , EUVD-2026-17414

cvss
10.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
35.0%
EPSS 35.0% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB, plus a Nuclei check

Summary

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.

Patch / fix

  • npm @nocobase/plugin-workflow-javascript 2.0.28
  • nocobase nocobase 2.0.28

Timeline

  1. Published
  2. First public exploit (EDB-52552)

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
7 mo ago

Exploit prediction

34.97% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-52552 NocoBase 2.0.27 - VM Sandbox Escape local, 2026-05-07
  • Nuclei template NocoBase - VM Sandbox Escape to Remote Code Execution nuclei detection template
  • github.com https://github.com/nocobase/nocobase/security/advisories/GHSA-px3p-vgh9-m57c referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
GitHub 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm @nocobase/plugin-workflow-javascript
<2.0.28
2.0.28

Affected products

  • nocobase nocobase

Classification

Weakness
  • CWE-913 Improper Control of Dynamically-Managed Code Resources

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.