CVE-2026-73483: Flowise before 3.1.3 Sandbox Escape via Puppeteer
Flowise (packages flowise and flowise-components) in versions <= 3.1.2 contain a sandbox escape in the vm2/@flowiseai/nodevm JavaScript sandbox. An authenticated user with access to the /api/v1/node-custom-function endpoint can escape the sandbox by supplying attacker-controlled executablePath and args parameters to puppeteer.launch(), which internally invokes childprocess.spawn() outside the sandbox boundary. This allows execution of arbitrary OS commands as the Flowise process user (root in the official Docker image) and arbitrary host file disclosure via Chromium's file:// URL handling. In versions 3.0.8–3.1.2 exploitation requires ALLOWBUILTINDEP=true; earlier versions are exploitable by default. Fixed in 3.1.3.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Flowise (packages flowise and flowise-components)to a version that resolves this vulnerability.Fixed in 3.1.3 - Configuration
In Flowise versions 3.0.8–3.1.2, exploitation requires ALLOW_BUILTIN_DEP=true; set ALLOW_BUILTIN_DEP=false to prevent the described sandbox escape via puppeteer.launch() (sandbox boundary bypass through child_process.spawn()).
Flowise sandbox escape mitigation ALLOW_BUILTIN_DEP = false
Event History
Frequently Asked Questions
What is the severity of CVE-2026-73483?
CVE-2026-73483 has a risk score of 77, indicating it's a high-severity vulnerability.
How do I fix CVE-2026-73483?
To fix CVE-2026-73483, upgrade to Flowise version 3.1.3 or later, which addresses the sandbox escape issue.
What systems are affected by CVE-2026-73483?
CVE-2026-73483 affects Flowise and Flowise-components versions 3.1.2 and earlier.
What is the impact of CVE-2026-73483?
CVE-2026-73483 allows an authenticated user to escape a JavaScript sandbox, potentially leading to OS command injection.
Who can exploit CVE-2026-73483?
An authenticated user with access to the /api/v1/node-custom-function endpoint can exploit CVE-2026-73483.