Open-Source Tool Synapse Can Block GitHub PR Merges When Vulnerabilities Are Detected

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A developer has detailed how to build a CI security gate using Synapse, an open-source security scanner written in Go, that automatically blocks pull request merges on GitHub when vulnerabilities are found. The setup runs entirely on static binaries — synapse-cli, syft, and grype — requiring no database or external server, making it lightweight enough for standard CI runners. When a pull request introduces a high-severity finding, the tool returns a non-zero exit code, posts a remediation comment on the PR, and uploads results to GitHub's Code Scanning tab via SARIF. The gate covers dependency vulnerabilities, source code issues, hardcoded secrets, and misconfigurations in Dockerfiles, Kubernetes, Helm, and Terraform files. A public demo repository has been shared so developers can test the workflow themselves rather than rely solely on the written guide.

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