NASA’s new dark energy space telescope can also detect killer asteroids
technologyreview.com·1h ago
Security
Trail of Bits Blog·May 22·5 min read
We hardened zizmor's GitHub Actions static analyzer
TL;DR
GitHub Actions workflows can be misconfigured to expose secrets to attackers via pull_request_target events, as demonstrated in the 2026 Trivy supply-chain attack. zizmor is a static analyzer that detects these misconfigurations before deployment. When GitHub added YAML anchors support in September 2025, zizmor's detection logic had gaps that required hardening to catch new attack patterns.
✦ Why It Matters
Engineers can use hardened zizmor to prevent supply-chain attacks by catching secret-exposure misconfigurations in CI/CD workflows before merge.
Key Takeaways
- Run zizmor to catch misconfigurations in your GitHub Actions workflows.
- Utilize the updated anchor support for better YAML handling.
- Review the fixed bugs to understand common pitfalls in YAML workflows.
- Consider building a test corpus for your own static analysis tools.
How It Works
Trail of Bits enhanced zizmor's parsing capabilities to fully support YAML anchors, which allow for reusable definitions in workflows. By fixing bugs related to alias handling and deserialization, the analyzer can now accurately process complex YAML structures.