William Woodruff discussed his project, Zizmor, a security linter designed to help developers identify and fix vulnerabilities within their GitHub Actions workflows. This tool addresses inherent security risks in GitHub Actions, such as injection vulnerabilities, permission issues, and mutable tags, by providing static analysis and remediation guidance. Fresh off the heels of the tj-actions/changed-files backdoor, this is a great topic with some things everyone can do right away.

The show notes and blog post for this episode can be found at https://opensourcesecurity.io/2025/2025-05-securing-github-actions-william-woodruff/

Recently, I had the pleasure of chatting with Paul Asadoorian, Principal Security Researcher at Eclypsium and the host of the legendary Paul's Security Weekly podcast. Our conversation dove into the often-murky waters of embedded systems and the Internet of Things (IoT), sparked by a specific vulnerability discussion on Paul's show concerning reference code for the popular ESP32 microcontroller.

The show notes and blog post for this episode can be found at https://opensourcesecurity.io/2025/2025-05-embedded-security-with-paul-asadoorian/

Dimitri Stiliadis, CTO from Endor Labs, discusses the recent tj-actions/changed-files supply chain attack, where a compromised GitHub Action exposed CI/CD secrets. We explore the impressive multi-stage attack vector and the broader often-overlooked vulnerabilities in our CI/CD pipelines, emphasizing the need to treat these build systems with production-level security rigor instead of ignoring them.

The show notes and blog post for this episode can be found at https://opensourcesecurity.io/2025/2025-04-tjactions_with_dimitri_stiliadis/

I chat with Alan Pope about the open source security tools Syft, Grype, and Grant. These tools help create Software Bills of Materials (SBOMs) and scan for vulnerabilities. Learn why generating and storing SBOMs is crucial for understanding your software supply chain and quickly responding to new threats like Log4Shell.

The show notes and blog post for this episode can be found at https://opensourcesecurity.io/2025/2025-04-syft-grype-grant-alan-pope/

Aaron Frost explores the overly complex world of vulnerability identifiers for end of life software. We discuss how incomplete CVE reporting creates blind spots for users while arming attackers with knowledge. The conversation uncovers the ethical tensions between resource constraints and security transparency, highlighting why the "vulnerable until proven otherwise" approach is the best path forward for end of life software.

The show notes and blog post for this episode can be found at https://opensourcesecurity.io/2025/2025-04-cve_eol_aaron_frost/

Cargo Semver Checks is a Rust tool by Predrag Gruevski that is tackling the problem of broken dependencies that cost developers time when trying to upgrade dependencies. Predrag's work shows how automated checks can catch breaking changes before they're released, potentially saving projects from unexpected failures and making dependency updates less painful across the entire Rust ecosystem.

The show notes and blog post for this episode can be found at https://opensourcesecurity.io/2025/2025-04-cargo-semver-checks-predrag-gruevski/

Lars Wirzenius discusses his innovative CI/CD system Ambient, which uses isolated virtual machines without network access to enhance security, and his work on Radicle, a peer-to-peer Git collaboration platform. Together, these projects offer a glimpse into a more distributed future for software development, addressing key challenges in current CI/CD systems like long wait times, security vulnerabilities, and centralized infrastructure limitations.

The blog post for this episode can be found at https://opensourcesecurity.io/2025/2025-03-ambient-radicle-lars-wirzenius/

William Brown tells us all about how confusing and complicated the FIDO authentication universe is. He talks about WebAuthn implementation challenges to flaws in the FIDO metadata service that affect how hardware tokens are authenticated against. The conversation covers the spectrum of hardware security key quality, attestation mechanisms, and the barriers preventing open source developers from improving industry standards despite their expertise.

The blog post for this episode can be found at https://opensourcesecurity.io/2025/2025-03-fido_auth_william_brown/

In this episode, open source legal expert Luis Villa breaks down what the EU's Cyber Resilience Act means for developers and businesses, exploring carve-outs for individual contributors and the complex relationship between security and sustainability. Luis provides practical guidance on navigating this evolving regulatory landscape while explaining why the CRA represents both a challenge and an opportunity for the open source ecosystem.

The blog post for this episode can be found at

https://opensourcesecurity.io/2025/2025-03-CRA_luis_villa/

Brian Fox discusses findings from a recent Sonatype report about the growing challenge of malicious packages in open source repositories. At the time of recording there are now over 820,000 malware packages in public repositories. Brian explains why certain ecosystems are more vulnerable than others and how behavioral detection methods can identify suspicious packages, and the challenge in solving this problem.

The blog post for this episode can be found at https://opensourcesecurity.io/2025/2025-03-oss_malware_brian_fox/