I built a PR listener and ruleset to detect malicious code in CI/CD
I built a GitHub app that detects it in pull requests, notifies or blocks them. Alongside it, I published a Semgrep ruleset for any stage of the CI/CD. I started this after getting frustrated by all the FUD around malicious code - lots of noise, little effort to solve it. Having said that, it's still a major attack vector - a stored RCE, with the codebase itself as the sink. Feedback is appreciated. The app, PRevent - https://github.com/apiiro/PRevent The ruleset: https://github.com/apiiro/malicious-code-ruleset The research:…
In plain words
PRevent is a GitHub app that scans pull requests to detect malicious code and can notify or block them. It includes a companion Semgrep ruleset for detecting malicious patterns at any stage of CI/CD pipelines. The tool addresses a real attack vector where compromised code can execute with repository access. It is designed for development teams seeking to add security checks to their code review process without extensive configuration overhead.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I built a GitHub app that detects it in pull requests, notifies or blocks them. Alongside it, I published a Semgrep ruleset for any stage of the CI/CD. I started this after getting frustrated by all the FUD around malicious code - lots of noise, little effort to solve it. Having said that, it's still a major attack vector - a stored RCE, with the codebase itself as the sink. Feedback is appreciated. The app, PRevent - https://github.com/apiiro/PRevent The ruleset: https://github.com/apiiro/malicious-code-ruleset The research: https://apiiro.com/blog/guard-your-codebase-practical-steps-...
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