CVE-2026-34156 EXPLOIT
9.9
CRITICAL · CVSS 3.1 · EPSS 6.8% (pctl 94)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 9.9 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 6.79% — more likely to be exploited than 94% of all CVEs |
| Weakness | CWE-913 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2026-03-31 |
| Last modified | 2026-07-24 |
Affected (1)
| Vendor | Product |
|---|---|
| nocobase | nocobase |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | NocoBase 2.0.27 - VM Sandbox Escape | 2026-05-07 |
References
→ the Explorer · watch your stack · NVD