CVEs / CVE-2026-34156

CVE-2026-34156: nocobase nocobase vulnerability

critical 9.9 CVSS 3.1 (NVD)
EPSS 34.9% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
Last changed at its sources 28 Oct 2026

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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.
The CVE record, via NVD · published 31 Mar 2026 · NVD status: Analyzed

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
nocobase nocobase	< 2.0.28	—

As stated by OSV
Product	Affected	Fixed in
@nocobase/plugin-workflow-javascript (npm)	before 2.0.28	2.0.28

Package versions from GHSA-px3p-vgh9-m57c.

Exploitation

Not in the CISA Known Exploited Vulnerabilities catalog as of 30 Oct 2026.

Severity

CVSS 3.1	9.9 critical `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H` Scored by NVD
Weakness	CWE-913

References

CVE-2026-34156 on NVD
CVE-2026-34156 on OSV
https://github.com/nocobase/nocobase/pull/8967 Issue Tracking, Patch
https://github.com/nocobase/nocobase/releases/tag/v2.0.28 Product, Release Notes
https://github.com/nocobase/nocobase/security/advisories/GHSA-px3p-vgh9-m57c Exploit, Mitigation, Vendor Advisory

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.