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

June 16, 2026 (updated July 20, 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

Detect and mitigate CVE-2026-54312 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →