StepSecurity - Detect, Prevent, and Respond to Software Supply Chain Attacks

On June 24, 2026, an attacker compromised the codfish/semantic-release-action GitHub repository. At 15:39:06 UTC they force-pushed a malicious commit and repointed several version tags to that commit. As a result, any workflow running against those tags after that time executed the attacker's code inside its GitHub Actions runner.

On June 17, 2026, an attacker compromised the @mastra npm organization and quietly added easy-day-js as a dependency across 140+ packages in the Mastra AI framework ecosystem. easy-day-js is a typosquat of the popular dayjs date library, and its latest version contained an obfuscated postinstall dropper that downloaded and ran a second-stage payload from attacker-controlled servers, then deleted itself to remove any trace. Packages with a combined weekly download count exceeding 1.1 million were exposed. If you installed any @mastra package today, treat your environment as compromised.