PatchTheCVECVE-2026-58057: Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitiv
CVE-2026-58057 is a medium-severity flaw (CVSS 5.0) affecting flowise. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.0 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 1.6% (top 25%) |
| CISA exploited list | No |
| Weakness | CWE-178 |
| Published | 2026-06-28 |
| Last modified | 2026-10-25 |
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Exploit-DB: Flowise 3.1.3 - arbitrary code execution
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-58057?
flowise: upgrade to 3.1.3. Exact commands for each OS are on this page.
Is CVE-2026-58057 being exploited?
CVE-2026-58057 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-58057 affect?
CVE-2026-58057 affects flowise. Severity is medium (CVSS 5.0). 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 deny
How urgent is CVE-2026-58057?
Priority 41/100. Public exploit reference
Software pages
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