Vulnerability in FlowiseAI Flowise

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund1 Nov 2026WID-SEC-2026-4270

  Flowise: Schwachstelle ermöglicht Ausführen von beliebigem Programmcode mit den Rechten des Dienstes DE

  CVE-2026-119978

[ References ]References

• github.com/FlowiseAI/Flowise
• github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/com…
• github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/com…
• github.com/advisories/GHSA-9gvv-qjj3-2p6g
• github.com/soovwv/cve/blob/a37354aff1e78c0601772e7716f5318c473e8640/CVE-2026-119978.md
• www.vulncheck.com/advisories/flowise-through-3.1.4-custom-function-sandbox-escape-rce-v…