{"cve":"CVE-2026-34156","nvd":{"published":"2026-03-31T14:16:12.170","modified":"2026-07-24T22:10:00.140","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":9.9},"cwes":["CWE-913"],"references":["https://github.com/nocobase/nocobase/pull/8967","https://github.com/nocobase/nocobase/releases/tag/v2.0.28","https://github.com/nocobase/nocobase/security/advisories/GHSA-px3p-vgh9-m57c"],"products":["nocobase:nocobase"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-34156","score":0.34966,"percentile":0.98433,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-px3p-vgh9-m57c","url":"https://osv.dev/vulnerability/GHSA-px3p-vgh9-m57c","summary":"NocoBase Affected by Sandbox Escape to RCE via console._stdout Prototype Chain Traversal in Workflow Script Node","modified":"2026-03-31T19:05:42.569322Z","packages":[{"ecosystem":"npm","name":"@nocobase/plugin-workflow-javascript","purl":"pkg:npm/%40nocobase/plugin-workflow-javascript","ranges":["<2.0.28"],"fixed":["2.0.28"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}