CVE-2026-119978
Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStore
CVSS Score
8.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-749 |
| Vendor | flowiseai |
| Product | flowise |
| Published | Oct 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
FlowiseAI / Flowise
0 ≤ 3.1.4
References
github.com: https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L55-L114 github.com: https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L1733 github.com: https://github.com/advisories/GHSA-9gvv-qjj3-2p6g github.com: https://github.com/FlowiseAI/Flowise vulncheck.com: https://www.vulncheck.com/advisories/flowise-through-3.1.4-custom-function-sandbox-escape-rce-via-localfilestore
Credits
soovwv