Bringing full YAML anchor support to zizmor
Summary: Trail of Bits worked with zizmor's maintainers over three months to bring the GitHub Actions static analyzer's YAML anchor support to full coverage, fixing parsing bugs that caused crashes, wrong-location findings, and mishandled aliased values, and filing 20 issues and 15 merged pull requests. The work was validated against a corpus of 41,253 workflows from 6,612 high-value open-source repositories, where zizmor had crashed on 45 workflows and only 43 (roughly 0.1%) used YAML anchors.
Why it matters: The article opens with attackers exploiting a pull_request_target misconfiguration in aquasecurity/trivy-action in March 2026 to exfiltrate secrets and backdoor LiteLLM on PyPI - a supply-chain compromise that began with a single misconfigured workflow, which is the class of defect zizmor exists to catch before it ships.
Read the original at Trail of Bits Blog ↗
- Topics
- Zero-Days & Exploits
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