CVE-2026-54312: n8n: Microsoft SQL Node Prototype Pollution

June 16, 2026

An authenticated user with permission to create or modify workflows could achieve global prototype pollution via the Microsoft SQL node by supplying a crafted value as the table parameter. This pollutes Object.prototype process-wide for the lifetime of the n8n server process, causing application-wide validation failures and rendering the n8n instance completely non-functional until restarted.

References

github.com/advisories/GHSA-x6p3-m6h9-fx7r
github.com/n8n-io/n8n/security/advisories/GHSA-x6p3-m6h9-fx7r
nvd.nist.gov/vuln/detail/CVE-2026-54312

Code Behaviors & Features

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