by Kastro
Paper/Archive/CVE-2026-119978

CVE-2026-119978

FlowiseAI Flowise — Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStore

CVSS 9.0
critical.is priorityof 100
27
CVSS 9.0 (CNA)9.0 / 10 × 3027.0Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Flowise≤ 3.1.4–CNA

Scores by source

VulnCheck (CNA)9.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
VulnCheck (CNA)8.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References

writeupgithub.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L55-L114writeupgithub.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L1733refgithub.com/advisories/GHSA-9gvv-qjj3-2p6grefgithub.com/FlowiseAI/Flowisewriteupvulncheck.com/advisories/flowise-through-3.1.4-custom-function-sandbox-escape-rce-via-localfilestore