The article reveals six JavaScript zero-day vulnerabilities that raise concerns about potential supply chain attacks. Experts, including Sectigo's Soroko and ColorTokens' Raju, point out that existing safeguards like disabling lifecycle scripts and using lockfiles with integrity hashes might not be sufficient. These measures are intended to prevent unauthorized code execution and ensure consistent installations. However, if attackers exploit weaknesses in Git dependency handling or integrity coverage, they could execute malicious code even in supposedly secure environments. Raju emphasizes that trust in package maintainers is a significant vulnerability. If attackers can manipulate a maintainer's system, they might post compromised versions of packages. The vulnerabilities primarily arise from npm lifecycle scripts, which can be exploited by malware. Raju warns that malicious scripts might connect to attackers' command-and-control servers or harvest credentials from compromised systems. Each package manager displays different weaknesses. For npm, the issue lies in Git dependencies where malicious repositories can manipulate behavior through .npmrc files. With pnpm, a gap exists where scripts can still run despite being disabled by default. vlt has a tar extraction vulnerability that allows arbitrary file writes, and Bun’s trust model is flawed, allowing easy spoofing. The gravity of these vulnerabilities necessitates stronger developer controls, such as rotating tokens and credential protection, to mitigate risks in software supply chains.