CVE-2026-58057
Medium
Description
Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'node_options' bypasses the NODE_OPTIONS denylist entry. An authenticated user who can configure a Custom MCP node can thereby inject NODE_OPTIONS --require and execute arbitrary code in the Flowise server context.
SeverityMedium
CVSS5.0
Exploit probability—
ProductFlowise
PublishedJun 28, 2026
First seenJun 28, 2026
Weakness typeCWE-178CWE-178
How to fix
Update
- flowiseai flowise3.1.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| flowiseai flowise | v < 3.1.3 | 3.1.3 |
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