CVE-2026-58057Flowise 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 'nod…
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.0 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-178
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
flowiseai flowise flowiseai:flowise | before 3.1.3 | NVD |
References
- https://github.com/FlowiseAI/Flowise/pull/6471issue-tracking, patch
- https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-pocexploit, third-party-advisory
- https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivityexploit, patch, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.