CVE-2026-119978
Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStore
- State
- Published
- Severity
- 9.0 Critical
- Published
- Oct 30, 2026
- Updated
- Oct 30, 2026
- Reserved
- Oct 30, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.0 Critical | CVSS: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 |
| 3.1 | 8.5 High | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-749 Exposed Dangerous Method or Function
Affected Products
| Product | Versions |
|---|---|
FlowiseFlowiseAI |
|
References
- https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L55-L114technical-description
- https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L1733technical-description
- GitHub Security Advisory (GHSA-9gvv-qjj3-2p6g)related
- https://github.com/FlowiseAI/Flowiseproduct
- VulnCheck Advisory: Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStorethird-party-advisory
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