CVE-2026-119978 Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStore
CriticalCVSS 9.0
EPSS 0.34%
- Published
- Updated
- Exploit status
- No public exploit known
Description
Flowise through 3.1.4 contains a sandbox escape vulnerability that allows authenticated users to execute OS commands by abusing allowlisted langchain and mammoth modules when ALLOW_BUILTIN_DEP=true. Attackers can submit JavaScript to /api/v1/node-custom-function that writes a file into the mammoth package via LocalFileStore and requires it, escaping vm2 as the Flowise process user.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| FlowiseAI Flowise | <= 3.1.4 | No fix listed |
References
- Researcher write-up technical-description
- github.com technical-description
- GitHub Security Advisory (GHSA-9gvv-qjj3-2p6g) related
- github.com product
- VulnCheck Advisory: Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStore third-party-advisory