Vulnerability in Nocobase
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.068 (93.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.350 · newest: 0.068 · change: -0.282
Affected products
- Nocobase — versions < 2.0.28
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/nocobase/nocobase/security/advisories/GHSA-px3p-vgh9-m57c (Exploit, Mitigation, Vendor Advisory)
- github.com/nocobase/nocobase/pull/8967 (Patch, Issue Tracking)
- github.com/nocobase/nocobase/releases/tag/v2.0.28 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34156?
- CVE-2026-34156 is a critical-severity vulnerability in Nocobase, classified under Improper Control of Dynamically-Managed Code Resources. CVSS score: 9.9/10. Published 2026-03-31.
- How severe is CVE-2026-34156?
- Critical severity. CVSS v3 base score is 9.9 out of 10.
- Is CVE-2026-34156 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.