Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/FlowiseAI/Flowise
- https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c
- https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c
- https://github.com/advisories/GHSA-9gvv-qjj3-2p6g
- https://www.vulncheck.com/advisories/flowise-through-3.1.4-custom-function-sandb
FAQ
What is CVE-2026-119978?
CVE-2026-119978 is a vulnerability with a CVSS score of 8.5 (HIGH). 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. A...
How severe is CVE-2026-119978?
CVE-2026-119978 has been rated HIGH with a CVSS base score of 8.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-119978?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.