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Public proof of conceptFix available

CVE-2026-34156

A public proof of concept exists; no exploitation attested.

  • Published2026-03-31
  • Fixed in2.0.28
  • WeaknessCWE-913

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-03-3114:16CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-34156?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-34156?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Nocobase
BranchAffectedFixed in
2.0< 2.0.282.0.28

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Nocobase to 2.0.28

Advisories and patches

Detection

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-52552
Exploit-DB
Proof-of-concept repositories
2 repositories, unverified0xBlackash/CVE-2026-34156Dhananjayasj/CVE-2026-34156-NocoBase-Sandbox-Escape-via-Workflow-Execution-Vulnerability-
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
2026-03-31
Last Modified
2026-07-24
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-34156?

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.

Is CVE-2026-34156 actively exploited?

A proof-of-concept exploit exists for CVE-2026-34156, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-34156?

CVE-2026-34156 has a CVSS v3 base score of 9.9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

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