Vulnerability in Flowiseai Flowise
CVE-2026-119978
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/pack… (technical-description)
- github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/pack… (technical-description)
- github.com/advisories/GHSA-9gvv-qjj3-2p6g (related)
- github.com/FlowiseAI/Flowise (product)
- www.vulncheck.com/advisories/flowise-through-3.1.4-custom-function-sandbox-esca… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119978?
- CVE-2026-119978 is a high-severity vulnerability in Flowiseai Flowise, classified under CWE-749. CVSS score: 8.5/10. Published 2026-10-30.
- How severe is CVE-2026-119978?
- High severity. CVSS v3 base score is 8.5 out of 10.