How Loose Version Constraints Enable Supply Chain Attacks

Version ranges in dependency files—seemingly minor syntax differences like ^4.17.21 versus 4.17.21—can fundamentally alter which code runs in production, creating overlooked supply chain vulnerabilities. Understanding semantic versioning operators is critical because they determine not only whether security patches arrive automatically, but also whether malicious or compromised package releases can bypass dependency constraints. This makes version specifications an active component of supply chain security, not merely development metadata.