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On June 24, 2026, an attacker published malicious versions of 20 npm packages belonging to the Leo Platform ecosystem in a coordinated burst spanning less than three seconds. All 20 packages carry an identical CI/CD attack toolkit that steals secrets from GitHub Actions runners, cloud credential stores, package registries, and password managers, then exfiltrates them via the victim's own GitHub token. Together these packages receive approximately 13,600 downloads per week.

On June 24, 2026, an attacker compromised the simonecorsi/mawesome GitHub repository. They force-pushed malicious commits 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 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.

A coordinated 8-month supply chain attack planted credential-stealing code inside fake AI coding assistants on the JetBrains Marketplace, quietly exfiltrating OpenAI, DeepSeek, and SiliconFlow API keys to an attacker-controlled server in Beijing -- which our investigation found still operational today.

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.

npm and Python supply chain attacks run on developer machines and steal secrets. See how Package Configs audits registry, cooldown, and auth across your fleet

On June 11th 2026, security researchers and the Arch Linux community disclosed a large-scale supply-chain attack against the Arch User Repository (AUR). Attackers hijacked more than 400 community packages and turned them into a malware delivery network. While the immediate blast radius is limited to Arch Linux systems, the campaign is a textbook example of how modern attackers compromise developers and CI infrastructure by abusing trust in open-source ecosystems.

Miasma and Hades worms are spreading across npm and PyPI, running on import and project open. See how Dev Machine Guard's Suspicious Files detects them.